The base of a tentacle bisected in the middle line.
From the broader portion of the planula an outgrowth arises which becomes the first tentacle of the cormus.
The athorome of Physophora, &c., consisting of siphon, tentacle, one or more palpons with palpacles, and one or more gonophores.
tentacles are hollow; but in some cases the tentacle may become solid by obliteration of its cavity.
Foot with anterior transverse groove; a posterior pallial tentacle; generally burrowing.
As a result of this extension of the umbrellar margin, all structures belonging to this region, namely, the ring-canal, the nerve-rings, and the rim of thickened ectoderm, do not run an even course, but are thrown into festoons, caught up under the insertion of each tentacle in such a way that the ring-canal and its accompaniments form in each notch of the umbrellar margin an inverted V, the apex of which corresponds to the insertion of the tentacle; in some cases the limbs of the V may run for some distance parallel to one another, and may be fused into one, giving a figure better compared to an inverted Y.
Posterior cephalic tentacle; and b, the eyes.
From the ring-canal are given off tentacle-canals which run down the axis of each tentacle; in many cases, however, the cavity of the tentacle is obliterated and instead of a canal the tentacle contains a solid core of endoderm.
Naturally, it is among the free living forms that the parapodium is best developed, and least developed among the tubicolous belongs typically a long tentacle, the cirrus, which 'r podium or neuropodium, and may be developed into an arborescent gill or into a flat scale-like process, A the elytron (in Polynoe, &c.).
They are found one on each cephalic tentacle, and are simply minute open pits or depressions of the epidermis, the epidermic cells lining them being pigmented and connected with nerves (compare fig.
Considering the imprisonment of the ostracod body within the valves, it is more surprising that the Asteropidae and Cypridinidae should have a pair of compound and sometimes large eyes, in addition to the e median organ at the base of I the " frontal tentacle," than 6 that other members of the group should be limited to P that median organ of sight, or have no eyes at all.
Their appearance and position suggest that they are in some way related morphologically to the gill-plates, the anterior labial tentacle being a continuation of the outer gill-plate, and the posterior a continuation of the inner gill-plate.
i, Each such body has a basal hollow portion (en) sur mounted by a glandular cushion (kl), from the centre of which projects a small, solid; club-shaped process or tentacle (t').
Each tentacle is to the stem of a plant, and is repre sented with the base of attachment a glove-finger like outpush uppermost; the mouth, not actually ing of the whole wall of the seen in the drawing, is at the lower sac and contains typically extremity of the body, surrounded a prolongation of its internal by the circle of tentacles.
2.-I, Portion of epithelium from the tentacle of an Actinian, showing three supporting cells and one sense cell (sc); 2, a cnidoblast with enclosed nematocyst from the same specimen; 3 and 4, two forms of gland cell from the stomodaeum; 5a, 5b, epithelio-muscular cells from the tentacle in different states of contraction; 5c, an epithelio-muscular cell from the endoderm, containing a symbiotic zooxanthella; 6, a ganglion cell from the ectoderm of the peristome.
The rhodalome of some Rhodalidae, consisting of siphon, tentacle and one or more gonophores.
- Vacuolated Endoderm Cells of cartilaginous consistence from the axis of the tentacle of a Medusa (Cunina).
22 and 28); it gives off a branch to each tentacle, and these all anastomose at the base of the tentacles with the second nerve of the arm, the so-called secondary arm-nerve.
modifications of a tentacle, as in Trachylinae, or developed from the margin of the umbrella, in no connexion with a tentacle (or, if so connected, not producing any modification in the tentacle), as in Leptolinae.
Further, two distinct types of otocyst can be recognized in the Hydro medusae; that of the Leptolinae, in which the entire organ is ectodermal, concrement-cells and all, and the organ is not a tentaculocyst; and that of the Trachylinae, in which the organ is a tentaculocyst, and the concrement-cells are endodermal, derived from the endoderm of the modified tentacle, while the rest of the organ is ectodermal.
e, Siphon with branched grappling tentacle, f.
Shell with prominent spire; distant from right tentacle, generally appendiculated; brackish water or fluviatile.
a, mouth; b, cephalic tentacle; h, gill (ctenidium).
Each cansists of an eversible hollow tentacle provided with hooklets and capable of introversion within a mem The excretory organs consist of flame-cells, richly convoluted canaliculi, and a pair of longitudinal canals leading to the exterior by one or more pores.
In many cases it appears that only the brilliantly coloured tentacle is pecked off by the bird, and as the snail can easily regenerate a new one, this in turn becomes infected by a fresh branch of the sporocyst ramifying through the snail and thus a new supply of larvae is speedily provided (Heckert).
Clark.) Rudimentary tentacle of the tentaculocyst.
- Free medusae with rhopalia of the normal type; the exumbrella is divided by a circular, so-called coronal groove, into two parts, a central portion, which is conical, thimble-shaped, or domed in form, and a peripheral portion, the pedal zone, which bears the marginal lobes, tentacles and rhopalia; the pedal zone is subdivided into areas termed pedalia, from each of which arises a tentacle or rhopaliurn in the interspace between two adjacent lobes of the margin.
1, with the addition of T, prostomial tentacle; Pa, parapodium.
The process carrying the otolith outer side of a or concretion hk, formed by endoderm cells, is tentacle, two enclosed by an upgrowth forming the " vesicle," nerves run round which is not yet quite closed in at the top. the base of the (After Hertwig.) tentacle to it.
Similarly the ring-canal runs round the edge of the lobe as the so-called festoon-canal, and then runs upwards under the peronium to the base of the tentacle as one of a pair of peronial canals, the limbs of the V-like figure already mentioned.
tw, Tentacle root.
Thus a bract may be regarded, with Haeckel, as a modified umbrella of a medusa, a siphon as its manubrium, and a tentacle as representing a medusan tentacle shifted in attachment from the margin to the sub-umbrella; or a siphon may be compared with a polyp, of which the single tentacle has become shifted so as to be attached to the coenosarc and so on.
t, tentacle; g.p, gastric pouch; r.c, radial canal not present in C and C'; c.c, circular or ring-canal; e.1, endoderm-lamella formed by concrescence.
- Diagram of a typical Hydropolyp. Hydranth; Hydrocaulus; Hydrorhiza; Tentacle; Perisarc, forming in the region ' of the hydranth a cup or hydrotheca(h, t), - which, however,is only found in polyps of the order Calyptoblastea.
(Anthomedusae) and only one tentacle.
side of the first out A, B, C, E, F, In vert, Tentacle.
codon, forming t, Tentacle.
derm on the distal side of t, Tentacle.
- The genus Monobrachium is a colonyforming hydroid which grows upon the shells of bivalve molluscs, each polyp having but a single tentacle.
The hydranth almost always has a single circlet of tentacles, like the Bougainvillea-type in the preceding sub-order; an exception is the curious genus Clathrozoon, in which the hydranth has a single tentacle.
a streak of thickened ectoderm supporting the tentacle.
each appendage as a distinct in i, Tentacle.
per, Peristomium, probably equal pr.t, Prostomial tentacle.
a, Cephalic tentacle.
Below the surface these walls are excavated with blood-vessels, so that the sac is practically a series of blood-vessels covered with renal epithelium, and forming 6 Cephalic tentacle.
T, Cephalic tentacle.
skirt forming the roof of the d, Cephalic tentacle.
b, Cephalic tentacle.
(Lankester.) Anterior cephalic tentacle.
a, Nerve to superior cephalic tentacle.
(Natural size.) D, Leucochloridium removed from the tentacle.
n, Anterior labial tentacle.
o, Posterior labial tentacle.
i, Anterior labial tentacle.
k, Posterior labial tentacle.
1, Labial Tentacle.
r, Line of origin of the posterior labial tentacle.
t, Labial tentacle.
pt, Prostomial tentacle.
It is probable enough that smaller fishes are attracted in this way, but experiments have shown that the action of the jaws is automatic and depends on contact of the prey with the tentacle.
You see that slender hairspring of free game golf internet mini play Rosium uncurl and rise, trembling and waving about like a tentacle?
quivering tentacle of Rosium, vibrating for a few moments like a thread of silver.
Up shot the game play pool yahoo glittering, quivering tentacle of Rosium, vibrating for a few moments like a thread of silver.
For the extension of a squid tentacle, our numerical results are in excellent agreement with existing experimental results.
uncoil like a tentacle?
vibrateot the game play pool yahoo glittering, quivering tentacle of Rosium, vibrating for a few moments like a thread of silver.
(Lankester.) a, Cephalic tentacle.
l.a, Filamentous appendage of the labial tentacle.
lb, Hood-like appendage of the labial tentacle.
m, Line of origin of the anterior labial tentacle.
Up shot the game play pool Yahoo glittering, quivering tentacle of Rosium, vibrating for a few moments like a thread of silver.
In the curious hydroid Monobrachium a single tentacle is present, and the same is the case in Clathrozoon; in Amphibrachium and in Lar (fig.
8), seen in solid tentacles as a row of cubical vacuolated cells, occupying the axis of the tentacle, greatly resembling notochordal tissue, particularly that of Amphioxus at a certain stage of development; as a fourth variety of endodermal cells excretory cells should perhaps be reckoned, as seen in the pores in the foot of Hydra and elsewhere (cf.
3 and 22) there is but a single tentacle, while two are found in Amphinema and Gemmaria (Anthomedusae), and in Solmundella bitentaculata (fig.
34, 35), representing a tentacle greatly reduced in size, ??I, 0 ?
The ocelli occur usually either on the inner or outer sides of the ten tacles; if on the inner side, the tentacle is turned upwards and t ®Q carried over the ex - umbrella so ®m r s ???.
Thus the ectodermal rim runs round the edge of each lobe of the umbrella and then passes upwards towards the base of the tentacle from the re-entering angle between two adjacent lobes, to form with its fellow of the next lobe a tentacle-clasp or peronium, i.e.
- Upper sur- sisting of a bract, siphon, tentacle and face of Velella, showing gonophore; when free it is known as pneumatophore and sail.
with a single long tentacle (cf.
Oesophageal pouches present; pedal nerve-centres concentrated; a pedal penis near the right tentacle.
Shell with medium spire, external or partly covered by the mantle; genital aperture below the right posterior tentacle; genital apparatus generally provided with a dart-sac and multifid vesicles.
s, Sockets; b, dental plates; along it, give off a blind branch V, mouth; de, labial appendage in to each tentacle (fig.
The left anterior tentacle (seen in the figure) is joined at its base in front of the mouth (w) to the right anterior tentacle, and similarly the left (o) and right posterior tentacles are joined behind the mouth.
SIZE Never more than about l cm in height, with a 1.5 tentacle span.
Do you see that hair wire of Rosium uncoil like a tentacle?
Designer Tim Schafer spent over a decade at LucasArts creating games like Full Throttle, Grim Fandango, and Day of the Tentacle.
The uppermost is a purely muscular cell from the sub-umbrella; the two lower are epidermo-muscular cells from the base of a tentacle; the upstanding nucleated portion forms part of the epidermal mosaic on the free surface of the body.
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