1866.] DR. J. E. GRAY ON THE SKULLS OF DOLPHINS. 215 



length of the brain-case, and as long as twice and one-third the width 

 at the notch. Teeth five in an inch. Tursio clorcides, Gray, Cat. of 

 Seals & Whales, p. 400. 



Clymene obscura. Beak of the skull once and one-sixth the 

 length of the brain-case, and as long as twice and one-half the width 

 at the notch. Teeth five or six in an inch. The aperture of the 

 blower large. Tursio obscurus, Gray, Cat. Seals & Whales, p. 264 ; 

 Zool. E. &T. t. 16. 



These skulls are somewhat like those of the genus Tursio, but the 

 teeth are small. 



Tursio. 



The skull large, thick, heavy, with a high swollen brain-cavity. 

 The beak longer than the brain-case, broad, conical, stout, shelving 

 on the sides. Teeth large, ^ or ^. The blower large. Nasal tri- 

 angle produced considerably before the notch. 



3. Tursio metis, Zool. E. & T. t. 18. 



4. Tursio cymodoce, Zool. E. & T. t. 19. 



6. Tursio truncatus. North Sea and Mediterranean. 



8. Tursio eurynome, Gray, Zool. E. & T. t. 17. South Sea; 

 India ? 



10. Tursio catalania. North-west coast of Australia. 



These skulls are all so much alike that they may only be varieties. 



EUTROPIA. 



Skull depressed, thick, with the sides rather bent down behind 

 the notch. The beak depressed, broad, rounded on the sides, rather 

 longer than the length of the brain-case ; the intermaxillaries flat, 

 rather broad. Teeth small, slender, five or six in an inch. 



Eutropia, Gray, P. Z. S. 1862, p. 145 ; Cat. Seals & Whales, 

 p. 262. 



Eutropia dickiei. Tursio eutropia, Gray, P. Z. S. 1862, p. 145 ; 

 Cat. Seals & Whales, p. 262. Chili. 



Eutropia heavisidii. Tursio heavisidii, Gray, Cat. Seals & 

 Whales, p. 263. From the Cape Seas. 



The D. cephalorhynchus of F. Cuvier, judging from the figure of 

 the skull given by Schlegel, appears also to belong to this genus. 



The skull bears a considerable affinity to the skulls of Pho- 

 ccena, Neomeris, Beluga, and Monodon in the bending down of the 

 sides. 



