CETACEA. 115 



This species, in the slenderness and length of the beak and 

 number of teeth, forms the passage between this and the next 

 section. 



In the Ipswich Museum there is a skull of a species allied to this, 

 if not the same. The beak is 2^ times as long as wide at notch ; 

 intermaxillaries convex, solid, with an elongated lanceolate space 

 in front ; triangle elongated, about ^ before the end of the tooth- 

 line, rugulose ; lower jaw slender in front, slightly truncated ; back 

 of the head convex, rounded ; palate flat, rather concave in the 

 middle of the front part; teeth ff. 



in. lin. 



Length, entire 16 



of lower jaw . . 13 3 



of beak 9 3 



Width at notch 3 6 



at orbits 7 9 



11. DELPHINUS FRENATUS. The BRIDLED DOLPHIN. 

 Blackish, paler on the sides, the belly white, end of tail black 



beneath; head black; sides ashy, with a dark band from the 

 angle of the mouth under the eye. 



Delphinus frenatus, F. Cuv. Mam. Lith. t. ; Cetac. 1. 1, 158, 



from Dussumier's description and drawing. 

 Inhab. Cape de Verd. 



Skull in the Paris Museum, from Cape de Verd, sent by Dus- 

 sumier. Length 18'0 inches, of beak 8'3, width at notch 3'5, 

 of middle of beak I'll ; teeth ff, rather larger than D. dubius; 

 palate smooth; intermaxillaries large, expanded; nasal convex 

 beneath ; triangle rather extended in front of the teeth-line, ru- 

 gose, and rather more so than D. dubius. There is a second 

 skull marked D. frenatus, No. 2: width at notch, 3'7; teeth ff 

 or M > palate flat ; nasal very convex, especially behind ; triangle 

 extending rather in front of the teeth-line, very rugose; jaws 

 rather strongly reflexed in front of the notch. 



b. Head longly beaked. Nose of skull slender, light, rather de- 

 pressed, especially in front, much longer than the head. 

 Teeth |g-g. Delphinus. 



* Skull flattened behind; triangle to the teeth-line ; palate flat t 

 not grooved on the side. 



12. DELPHINUS CLYMENE. 



Skull rather depressed, the hinder part slightly convex ; nose 

 rather depressed, shelving on the sides ; intermaxillaries convex, 



