Top of the head very convex : teeth conical, varying in number: pectoral fins long and narrow.
D. melas, Traill in Nichol. Journ. vol. xxn. p. 81. Flem. Brit. An. p. 34. D. globiceps, Cuv. Ann. du Mus. torn. xix. p. 14. pi. 1. f. 2, 3. D. Deductor, Scoresby, Arct. Reg. vol. 1. p. 496. pi. 13. f. 1.
Entire length from twenty to twenty-four feet.
Equalling the Grampus in size, but differing essentially from that species in the form and character of the fins; the dorsal much shorter, the pectorals longer, narrower, and more pointed: head short and round, with the forehead remarkably convex and prominent: upper jaw projecting a little beyond the lower: teeth conical, sharp, and a little bent; varying much in number in different individuals, not visible in very young specimens, and falling in advanced life; average number from twenty-two to twenty-four in all. Skin smooth, of a deep bluish black colour, with the exception of a whitish band beneath the body extending from the throat to the anus.
Common in large herds off the Orkney and Shetland Islands.
(3. Delphinaptera, Lacep).