. The depths of the sea. An account of the general results of the dredging cruises of SS. Porcupine and Lightning during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, , J. Gwyn Jeffreys, , and Dr. Wyville Thomson, Lightning (Ship); Ocean; Marine animals; Deep-sea temperature; Deep-sea desposits; Porcupine (Ship). 484 THE DEPTHS OF THE SEA. [chap. such recent forms as Aphrocallistes, Iphiteon, Sol- tenia, and Askonema with certain series of the chalk Ventriculites, there cannot be the slightest doubt that they belong to the same fam
. The depths of the sea. An account of the general results of the dredging cruises of SS. Porcupine and Lightning during the summers of 1868, 1869 and 1870, under the scientific direction of Dr. Carpenter, , J. Gwyn Jeffreys, , and Dr. Wyville Thomson, Lightning (Ship); Ocean; Marine animals; Deep-sea temperature; Deep-sea desposits; Porcupine (Ship). 484 THE DEPTHS OF THE SEA. [chap. such recent forms as Aphrocallistes, Iphiteon, Sol- tenia, and Askonema with certain series of the chalk Ventriculites, there cannot be the slightest doubt that they belong to the same family—in some cases to very nearly allied genera. Pig. 80 represents a very beautiful specimen of Ventriculites simplex preserved in flint, for which I am indebted to Mr. Sanderson of Edinburgh. Looking at this in the light of our knowledge of Euplectella or Aphrocallistes Beatrix, we have no difficulty in working out its structure, even to the most minute microscopic detail. Other sponges, belonging chiefly to the Lithistidie and the Corticatoe, re- produce with wonderful accuracy the more irre- gular sponge-forms of the chalk and green- sand ; and a group, as yet undescribed, but apparently an aberrant family of the Esperiadae, send out lon^ delicate tubes, which contract slightly, but in a most characteristic way, at the point of their insertion into the sponge body, recalling very forcibly the peculiar manner in which the tube-like root processes join the sponge in such genera as the vaguely defined Choanites. One sponge belonging to the group is represented at Eig. 83. A sphere 15 to 20 mm. in diameter con- sists of a smooth glossy external rind, composed of closely meshed pin-headed spicules, with two kinds. Fig. 81.—Ventriculites simplex, Todlmin Smith. Outer surface ; four times the natural Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmar, booksubjectocean
