Archive image from page 562 of The depths of the sea. 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, depthsofseaaccou00tho Year: 1873 CHAP. X.] CONTINUITY OF THE CHALK. 483 and he referred the group to the Polyzoa. When Mr. Toulmin Smith studied the Ventriculites, the Hexactinellidse — the sponges with six-rayed meshes or spicules—were practically unknown, though there
Archive image from page 562 of The depths of the sea. 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, depthsofseaaccou00tho Year: 1873 CHAP. X.] CONTINUITY OF THE CHALK. 483 and he referred the group to the Polyzoa. When Mr. Toulmin Smith studied the Ventriculites, the Hexactinellidse — the sponges with six-rayed meshes or spicules—were practically unknown, though there Fig. SO.—Ventriculites simpler, Toulmin Smith. Once and a half the natural size. were already a few examples in museums. One of the first results of deep-sea dredging was the discovery that the chalk-mud of the deep sea is in many places literally crowded with these ; and when we compare i i 2
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