. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 52 BULLETIN OF THE BUREAU OF FISHEKIES 17. Black dogfish (Centroscylliumfabricii Reinhardt) Jordan and Evermann, 1S96-1900, p. 56. Garman, 1913, p. 231. Description.—As pointed out elsewhere (p. 44), the notched margin of the upper tail lobe distinguishes this rare shark at a glance from the spiny dogfish, with which it agrees in the possession of a long pointed spine at the front edge of each dorsal fin, the second being longer than the first. It differs further in that its dorsal spine
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 52 BULLETIN OF THE BUREAU OF FISHEKIES 17. Black dogfish (Centroscylliumfabricii Reinhardt) Jordan and Evermann, 1S96-1900, p. 56. Garman, 1913, p. 231. Description.—As pointed out elsewhere (p. 44), the notched margin of the upper tail lobe distinguishes this rare shark at a glance from the spiny dogfish, with which it agrees in the possession of a long pointed spine at the front edge of each dorsal fin, the second being longer than the first. It differs further in that its dorsal spines are deeply grooved on each side, whereas in the "dog'' they are rounded; in the location of the ventral fins, the rear axils of which stand almost directly under the front origin of the second dorsal instead of some distance in front of it; in its small pectorals of rounded outline; in the structure of its teeth, each of which is tridentate, with sharp points; in its broad rounded snout; and in its very dark color. Like the spiny dogfish, it lacks an anal fin. Size.—The specimens so far described have ranged from 2^ to 3^2 feet in length—that is, about the same size as the spiny dogfish. Color.—Uniform dark brown to black, below as well as above. General range.—Positive records for this shark are from Greenland, Iceland,41 rather deep water off the outer banks, Grand to Georges,42 off the Hebrides and Faroes where two specimens were taken by the Norwegian fisheries steamer Michael Sars in 400 to 600 fathoms, and from the North Atlantic (two specimens in the British Museum). But since Tate-Regan43 thinks a specimen that he examined. Fig. 19.—Black dogfish (CentroscyUium fabricii). After Garman from the Falkland Islands is identical, while Goode and Bean (1896) tentatively refer to it a young shark from the Gulf of Mexico, and the Japanese C. ritteri seems hardly distinguishable, the black dogfish may prove to have a cosmopolitan range in deep waters. Occurrenc
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