. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. FISHES OF THE GULF OF MAINE 53 THE NURSE SHARKS. FAMILY SCYMNORHINIDiE The nurse sharks, like the spiny dogfishes, lack anal fins, but there are no spines in their dorsal fins and the teeth in the upper jaw are noticeably unlike those in the lower. 18. Greenland shark (Somniosus microcephalus Bloch and Schneider) Nurse shark; Sleeper shark; Gurry shark; Ground shark Jordan and Evermann, 1S96-1900, p. 57. Garman, 1913, p. 241. Description.—The Greenland shark is notable for its very small
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. FISHES OF THE GULF OF MAINE 53 THE NURSE SHARKS. FAMILY SCYMNORHINIDiE The nurse sharks, like the spiny dogfishes, lack anal fins, but there are no spines in their dorsal fins and the teeth in the upper jaw are noticeably unlike those in the lower. 18. Greenland shark (Somniosus microcephalus Bloch and Schneider) Nurse shark; Sleeper shark; Gurry shark; Ground shark Jordan and Evermann, 1S96-1900, p. 57. Garman, 1913, p. 241. Description.—The Greenland shark is notable for its very small dorsal fins, without spines, the second being of about the same size as the first, and for small pectorals hardly larger than the ventrals, coupled with the absence of an anal fin and with a tail of more ''fishlike" form than that of most other sharks except the mackerel-shark tribe. Bearing these points in mind, particularly the absence of anal fin and dorsal spines, it can not be confused with any shark common in our Gulf. The location of the first dorsal—about midway between pectorals and ventrals—is the most obvious "field mark" to distinguish it from the rare Echino- rhinus brucus (p. 55). We may note further that the Greenland shark is compara-. Fig. 20.—Greenland shark (Somniosus microcephalus). After Garman tively stout shouldered, tapering thence toward the tail; that its snout is blunt and rounded as Scoresby iS represented it a century ago (many more recent figures of it are caricatures in this respect); that the gill openings are short and located low down on the sides of the neck; and that the teeth are unlike in the two jaws, being narrow in the upper, and broad, square tipped, and notched at the outer corners in the lower jaw. Size.—This is one of the larger sharks. It is said to grow to a maximum length of 24 feet, but few, if any, actually reach such a size, IS feet being unusual. One 15 feet long has been taken in Cape Cod Bay; anothe
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