39 



This skull is very like the fonuer, but much smaller, 

 and the beak more conical. 



tt Beak of skull slender, subcylindrical. 



The Doris. Delphinus Doris. 



Tab. 20. Skull." 



D. Doris, Gray, Cat. Ost. B. M. .36. 



Skull roundish ; nose depi'essed, ^ of the entire length, 

 and 2 J times 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 be- 

 tween them in front ; an irregular impression in front of 

 the blower, rather elongate, extending a little before the 

 line of the hinder teeth ; teeth |4> slender, conical, incurv- 

 ed, acute; lower jaw, slender, very obliquely truncated ; 

 palate rather convex in front, tapering, shortly grooved 



This species, in the slenderness and length of the beak 

 forms the passage between this and the next section. 



The Bridled Dolphin. Delphinus frenatus. 



Delphinus frenatus, F. Cuv. Mam. Lith. t. Cetac. t. 

 1, 158. 



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. 



Inhab. Cape Verd, from Dussumier's description and 

 drawing. 



Skull in the Paris Museum, from Cape de Verde, sent 

 by Dussumier. Length 18"0 inches, of beak 8"3, width at 

 notch 3'5, of middle of beak I'll ; teeth ^, rather larger 

 than D. diibius ; palate smooth ; intermaxillaries large, 

 expanded; nasal convex beneath; triangle rather extended 

 in front of the teeth-line, rugose, and rather more so than 

 D. dubius. There is a second skull marked D. fratnalus. 

 No. 2, width at notch 37 ; teeth W or |4 ; 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 depressed, especially in front, much longer than 

 the head. Delphinus. 



* Skull flattened behind; triangle to the teeth line; 

 palate flat, not grooved on the side. 



The Metis. Delphinus Metis. 

 Tab. 18. Skull. 

 D. Metis, Chay, Cat. Ost. B. M. 36. 



Skull rather depressed, the hinder part slightly convex ; 

 nose rather depressed, shelving on the sides ; intermaxil- 

 laries convex, with an elongated groove between them in 

 front, 4 tlie entire length, twice and a half the length of 

 the width at the notch ; the triangular impression in front 

 of the blower rather elongate, produced a little beyond the 

 line of the hinder tooth, rugose in front, oblique, grooved 

 on each side ; teeth ^, small, slightly incurved, acute, six 

 in an inch. 



Inhab. ? Skull, Brit. Mus. 



Skull, length entire, 15'7 inches & lines. 



„ ofhead, 6'3 



„ of nose, 9'4 



„ of tooth-line, .... 7"4 



Width of temple, 6'10 



„ at nostril, 3"7 



„ at middle of back, 2'2 

 „ of intermaxillaries, I'O 

 This species is like the D. Doris in size, but has more 

 teeth, and the skull behind the frontal ridge is much flat- 

 ter, and gradually shelving to the foramen magnum, and 

 the beak is more depressed. 



D. Metis, var. In the museum of the Bristol Insti- 

 tution there is an imperfect skull, apparently of this spe- 

 cies, which differs in the nose being about f of an inch 

 shorter, and rather narrower. It has 36 teeth in the upper 

 jaw. 



Skull, length of nose .... 8 7 

 Width at notch .... 3 8 

 „ middle of nose 2 

 (There is a lower jaw fitted to it, which has no teeth 

 and a short gonyx, but it is doubtful if it belong to the 

 same animal) ; lower jaw 12'3, symphysis \'b. 



There is a second skull in the same collection, very .si- 

 milar, which has -|4 teeth. 



Skull, length entire .... 15 



„ of nose .... 9 



Width at notch .... 3 4 



„ at middle of nose 1 10 



This skull only differs from the former in the lower jaw 

 being slenderer and united by a longer symphysis in front. 



Lower jaw 12 6 long. 

 Symphysis 2 wide. 



They are probably indications of two other species. 

 The hinder part of the skull of the latter is also rather 

 more convex than the same part in D. Metis. 



The Styx. Delphinus Styx. 



Tab. 21. Skull. 



Skull roundish, rather flattened behind ; nose rather de- 

 pressed, rather convex in the middle, shelving on each 

 side, rather longer than the head, 4 the entire length, 



