Balanoglossus sentence example

balanoglossus
  • BALANOGLOSSUS, the general name given to certain peculiar, opaque, worm-like animals which live an obscure life under stones, and burrow in the sand from between tide-marks down to the abyssal regions of the sea.
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  • Eschscholtz at the Marshall Islands in 1825, Balanoglossus was described as a worm-like animal belonging to the Echinoderm order of Holothurians or sea-cucumbers.
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  • The possession of gill-slits is as interesting a feature in the organization of Balanoglossus as is the presence of tracheae in Peripatus.
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  • The chief resemblances ------ between Balanoglossus an Amphioxus in respect of `'?'
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  • The chief differences are, that (a) the tongue-bar is the essential vm, organ of the gill-slit in Balanoglossus, and exceeds FIG.
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  • phioxus; (c) the skeletal rods in the tongue-bars of Balanoglossus are double; (d) the tongue-bar in Balanoglossus does not fuse with the ventral border of the cleft, but ends freely below, thus producing a continuous U-shaped cleft.
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  • In most species of Balanoglossus each gill-slit may be said to open into its own atrial chamber or gill-pouch; this in its turn opens to the exterior by a minute gill-pore.
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  • The vascular system does not readily lend itself to morphological comparison between such widely different animals as Balanoglossus and Amphioxus, and the reader is therefore referred to the memoirs cited at the end of this article for further details.
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  • The development of Balanoglossus takes place according to two different schemes, known as direct and indirect, correlated with the occurrence in the group of two kinds of ova, large and small.
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  • Some thirty species of Balanoglossus are known, distributed among all the principal marine provinces from Greenland to New Zealand.
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  • One of the most singular facts concerning the geographical distribution of Enteropneusta has recently been brought to light by Benham, who found a species of Balanoglossus, sensu stricto, on the coast of New Zealand hardly distinguishable from one occurring off Japan.
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  • Bateson, "Memoirs on the Direct Development of Balanoglossus," Quart.
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  • Benham, "Balanoglossus otagoensis, n.
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  • Harmer, "Note on the Name Balanoglossus," Proc. Camb.
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  • Morgan, "Memoirs on the Indirect Development of Balanoglossus," Journ.
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  • Mesnil, "Balanoglossus Kochleri, n.
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  • Enteropneusta (see Balanoglossus).
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  • The conception of the Dipleurula derives its chief weight from the fact that it is comparable to the early larval forms of other primitive coelomate animals, such as Balanoglossus, Phoronis, Chaetognatha, Brachiopoda and Bryozoa.
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  • 2, nch.), growing forwards in the septum between the proboscis-cavity and the collar-cavities, and supported dorsally by the median mesentery of the collar, is the representative of the so-called notochord or stomochord of Balanoglossus; and if the view that this organ is really a notochord is well founded, it may be regarded as the homologue of the anterior end of the Vertebrate notochord.
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