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Show 1866.] DR. J. E. GRAY O N THE SKULLS OF DOLPHINS. 213 STENO. Steno, Gray, Cat. of Seals & Whales, p. 232. The species may be arranged by their skulls thus. The number refers to the number of the species in the above Catalogue:- a. Skull large, solid, the beak compressed, high. Teeth large, conical, about two in an inch of the length of the margin of the jaw. 3. STENO FRONTATUS. Beak of the skull short; the front part thick, high, and blunt. Teeth 24/24, large, two in an inch. 4. STENO COMPRESSUS. Beak of the skull elongate, compressed, attenuated in front. Teeth 26/26, large, two in an inch (Zool. E. & T. t. 27). Steno rostratus appears to belong to this section. b. Skull small, rather spongy. Teeth small, slender, attenuated, about four or five in an inch of the length of the margin of the jaw. * Beak of the skull elongate, compressed, much attenuated and acute in front. Teeth four in an inch. Sousa. 4*. STENO CAPENSIS. 4**. STENO LENTIGINOSUS. The skull of Steno roseiventris, according to the figure, appears to belong to this section of the genus. ^ ** Beak of the skull short, compressed, much attenuated and acute in front. Teeth five in an inch. Tucuxa. 7. STENO TUCUXI. *** Beak of the skull elongate, rather depressed, broad, slightly compressed on the sides. Teeth small, five in an inch. Stenella. 5. STENO ATTENUATUS. The beak of the skull flattened (Zool. E. & T. t. 28). This last section is nearly intermediate between Steno and Cly-mene. DELPHINUS. The species referred to Delphinus, Section b, in the c Catalogue of Seals and Whales,' belong to this genus. The teeth are small and slender, five or six in an inch. * Beak of skull twice as long as the brain-case. Teeth ~ or ^. 2. DELPHINUS LONGIROSTRIS. |
