On Some Remarkable Forms of Animal Life From the Great Deeps Off the Norwegian C

Cover On Some Remarkable Forms of Animal Life From the Great Deeps Off the Norwegian C
On Some Remarkable Forms of Animal Life From the Great Deeps Off the Norwegian C
G O Georg Ossian Sars
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On the dorsal side of the arms it forms more- over the peculiar transversal semi-cylindrical fleshy ridges, especially characteristic of this species, which are traceable even to the extreme point of the arm.
b. The ventral integument.
From the integuments properly so-called we distinguish the cuticular stratum, which is found on the ventral side inside the ambulacral skeleton, partly lining the bottom of the 17 ambulacral furrows and partly surrounding the oral aperture as the so-called bucal
...membrane. This ventral cuticle is of much finer and thinner consistency and without any trace of cal- careous deposits. In the ambulacral furrows it appears as a thin transparent membrane without any distinct structure; while the bucal membrane is remarkable for a high degree of contractility, for which reason also it is interwoven with numerous fine concentric and radial muscular fibres; it will be more particularly described hereafter.
c. The calcareous parts belonging to the integument.
Of the various calcareous deposits in question we may distinguish 3 principal groups: 1) the calcareous deposits in the interior stratum of the skin, 2) the spines issuing from the surface of the body and 3) the peculiar microscopic organs found in the exterior stratum of the skin, which we call pedicellarise.


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