4. TT7RSI0. 255 



small, conical, extending the greater part of the length of the jaws. 

 Palate flat. 



(jraiiipus, sp., Graji, Spic. Zool. 2, 1828. 



Delpliinus § a (Tiirsio), Grai/, Zool. Ereb. df Ten: 3G, 1817; Cat. Cetac, 



li. M. 105, ISrjO ; P. Z. S. 1803 ; 18G4, 236. 

 Cephalorliyiichus, F. Cuvier, Cetac. 



Delphinus § Cephalorliyiichus, Gray, Cat. Cetac. B. M. lOG. 

 Tursiops, Gervais, 3Iamm. 323. 



I. Beak short. Rostrum of sI'kU expanded over the orbits, thick, conical, 



convex above, half as long as the head. 



a. Bostram of skull slender, subcijlindrical. Nos. 1, 2. 



b. Rostrum of skull rather thick, conical, evenly tapering. Nos. 3, 4. 



c. Rostrum of skull rather thick, and rather swollen on the sides. 5, 6, 7, 8. 



II. Beak short. Rostrum of skull very broad, half as long as the head, 



shelving on the side. Skull shelving over the orbits. Eutrope. 



III. Beak scarcely produced. Rostrum of skull rather depressed, scarcely 



longer than the brain-cavity, convex. Skull expanded over the orbit, 

 leeth, 2 4 3 0^' 



I. Beak short. Rostrum of skull thick, conical, convex above, half as long as 

 the head. TiU'sio. 

 Tui-sio, Gray, Zool. Ereb. t^ Terr. 37 ; Cat. Cetac. B. M. 1850, 109. 

 Cetus, sp., Brisson. 



a. Rostrum of skull slender, subcylindrical. Teeth ff-j|. 

 1. Tursio Doris. The Doris. 

 Skull roundish ; rostrum depressed, four-sevenths of the entire 

 length, and twice and one-third the length of the width at the notch, 

 concave behind, rounded on the sides, convex in the middle of the 

 central ridge, flattened in front ; intermaxillaries convex, especially in 

 the middle of their length, with a groove between them in front ; an 

 irregular impression in front of the blower, rather elongate, extend- 

 ing a little before the line of the hinder teeth. Teeth |4 or ^, slender, 

 conical, incurved, acute ; lower jaw slender, very obliquely tinmcated ; 

 palate rather convex in front, tapering, shortly grooved behind. 



Delphinus Doris, Gray, Cat. Osteal. B. M. 3G ; Zool. Erebus 4' Terror, 

 39. t. 20 (skull) ; Cat. Cetac. B. M. 1850, 114. 



Inhab. ? 



a. Skull ? The speoimeu figured in the ' Voyage of the Erebus 



and Terror,' t.L^O. .^^ j.^ 



Skull : Length, entire 17 4 



Length of head 7 3 



Length of nose 10 1 



Length of teeth-line 9 2 



"Width at temples 7 9 



"Width at noNtiils 4 4 



Width at middle of beak 2 4 



Width at intermaxillaries 1 1 



