Teeth two only in the fore part of the lower jaw.
H. bidens, Flem. Brit. An. p. 36. H. Butskopf, Lacep. CStac. p. 319: Bottle-nose Whale with two teeth, Hunter in Phil. Trans. 1787. pi. 19. Beaked Whale, Penn. Brit. Zool. vol. III. p. 59. pl. 5. f. 1. Two-toothed Cachalot, Sow. Brit. Misc. pl. 1.
Entire length from twenty to twenty-five feet.
Body elongated ; greatest circumference in the region of the pectoral fins: forehead high, very convex, rising suddenly from the snout; this last short and depressed, terminating in a kind of beak somewhat similar to that of the genus Delphinus: lower jaw rather longer and larger than the upper: teeth conical, and pointed; only two, situate in the fore part of the lower jaw; sometimes altogether wanting, or not appearing above the gums: palate studded with little horny eminences, considered by Cuvier as rudimentary vestiges of whalebone: eyes large, a little above the line of the lips: blow-hole crescent-shaped, with the horns of the crescent directed towards the tail: dorsal fin placed considerably beyond the middle of the body, but little elevated, lanceolate, pointed, inclining backwards: pectorals small, oval, in the same horizontal line with that of the mouth. Skin smooth and glossy, blackish lead-colour above, whitish underneath, the two colours mixing on the sides.
Occasionally met with on the British shores. Hunter's specimen was taken in the Thames above London Bridge in 1783. - Obs. This species has been unnecessarily split into several by many authors: it probably embraces all the following of Desmarest's " Mammalogie;" Delphinus Chemnitzianus D. Hunteri, D. edmtulus, D. Hyperoodon, and D. Sowerbyi.