In fact, we have to suppose that the actual somite which in grades 1 and 2 bore the mandibles lost those mandibles, developed their rami as tactile organs, and came to occupy a position in front of the mouth, whilst its previous jaw-bearing function was taken up by the next somite in order, into which the oral aperture had passed.
This very effective and elaborate innervation, which has been directly traced to the brain, whence strong nerves (generally two) enter the proboscis, renders it exceedingly probable that the most important functions of the proboscis are of a sensiferous, tactile nature.
Sometimes the pair of appendages has not a merely tactile jointed ramus, but is converted into a claw or clasper.
Moreover, it appears probable that the first somite never had its parapodia modified as jaws, but became a prosthomere with tactile appendages before parapodial jaws were developed at all, or rather pan passu with their development on the second somite.
Coxal (maxillary) process, the apical segment tipped with a single movable or immovable claw; appendages of 3rd pair different from the remainder, tactile in function, with at least the apical segment many-jointed and clawless.
Having thus begun by touch and tactile inference, we confirm and extend our inferences of bodies in Nature by using the rest of the senses.
In addition to the eyes and the olfactory circle on the head scattered tactile papillae are found on the ectoderm.
When specialized as bearers of sensory (olfactory or tactile) organs, the rami are generally elongated, many-jointed and flagelliform.
Thelyphonus and its allies, however, have a long tactile caudal flagellum, the homologue of the scorpion's sting; but its exact use is unknown.
3), we find the same essential structure, but the prostomium may give rise to two or more tactile tentacles, From Goodrich, Q.
Dibular hemignaths is the second of Ant, Antenna or tactile ten the whole series.
The captacula are tactile and prehensile and can be protruded from the anterior aperture of the mantle.
Namely the Amblypygi of which Phrynus is a commonly cited type, these tactile appendages are exceedingly long and lashlike, whereas in the tailed division, the Uropygi, of which Thelyphonus is best known, the limb is much shorter and less modified.
Small tufts of tactile hairs or papillae are sometimes observed in small number at the tip of the head; sometimes longer hairs, apparently rather stiff, are seen on the surface, very sparingly distributed between the cilia, and hitherto only in a very limited number of small specimens.
46) is atrophied, or whether, if present, it has the form of a pair of tactile palps or of minute chelae.
From an evidential point of view the apparition is the most valuable class of death-warning, inasmuch as recognition is more difficult in the case of an auditory hallucination, even where it takes the form of spoken words; moreover, auditory hallucinations coinciding with deaths may be mere knocks, ringing of bells, &c.; tactile hallucinations are still more difficult of recognition; and the hallucinations of smell which are sometimes found as death-warnings rarely have anything to associate them specially with the dead person.
Each palpacle is a tactile filament, very extensile, without accessory filaments or nematocysts.
Remaining pairs of appendages with their basal segments immovably fixed to the sternal surface, similar in form, the posterior three pairs furnished with two claws supported on long stalks; the basal segments of the 6th pair bearing five pairs of tactile sensory organs or malleoli.
It is regarded as a modified zooecium, the polypide of which has become vestigial, although it is commonly represented by a sense-organ, bearing tactile hairs, situated on what may be termed the palate.
I cannot separate touching from my tactile organs, seeing from my eyes, or hearing from my ears.