. 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). chap, iv.] THE CRUISES OF THE ' PORCUPINE: 147 our friend Mr. Gwyn Jeffreys to the somewhat hazardous presumption that "its original home is in the boreal, perhaps even in the arctic ; Two very peculiar li
. 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). chap, iv.] THE CRUISES OF THE ' PORCUPINE: 147 our friend Mr. Gwyn Jeffreys to the somewhat hazardous presumption that "its original home is in the boreal, perhaps even in the arctic ; Two very peculiar little sponges were met with here rather frequently sticking to stones. A short smooth column, about 20 mm. in height, is surmounted in one species, which must I think be identified with Thecophora semisuberites, Oscau Schmidt, by a soft. Pig. -23.—Thecophora semtiuberites, Oscar Schmidt. Twice the natural size. (No 7C. j pad of spongy matter, with one or two projecting tubes with oscula in the centre. The other, which I shall call Thecophora ibla (Eig. 24), from its resem- blance to the cirripede of that name, ends in a scaly cone with a single osculum in the middle. The outer wall of the column in both forms is firm and glossy, under the microscope composed of closely-packed sheaves of needle-shaped spicules with their termi- nation blunt and slightly bulbous. The sheaves are L 2. 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 may not perfectly resemble the original Thomson, C. Wyville (Charles Wyville), Sir, 1830-1882; Carpenter, William Benjamin, 1813-1885; Jeffreys, John Gwyn, 1809-1885. London ; New York : Macmillan and co.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmar, booksubjectocean
