. 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, ix.] THE DEEP-SEA FAUNA. 433 I have already adverted to the danger we run in estimating the relative proportions in which any special groups may enter into the sum of the abyssal fauna, by the proportion in which the
. 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, ix.] THE DEEP-SEA FAUNA. 433 I have already adverted to the danger we run in estimating the relative proportions in which any special groups may enter into the sum of the abyssal fauna, by the proportion in which they are recovered by any single method of capture. From their con- siderable size, the length and rigidity of their strag- gling rays, and their habit of clinging to fixed ob- jects, the Echinodermata are not very readily taken. Pig. 69.—Thccopsammia socialis, Pourtales. Once and a half the natural size. (No. 57 1869.) by the dredge, but they fall an easy prey to the 'hempen tangles.' It is possible that this circum- stance may to a certain extent exaggerate their apparent abundance at great depths, but we have direct evidence in the actual numbers which are brought up, that in some places they must be won- F F. 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
