12. pseudorca. 79 



Beak of the skull twice as long as the width at the notch. Teeth 

 small, five in an inch. 

 Inhab. North Sea. 



11. LAGENORHYNCHUS. 



Lagenorhynchus, Gray, P. Z. S. I860, p. 216; Cat. S. fy W. p. 272 ; 



Synops. Whales §• Dolph. p. 7. 



Beak of the skull rather flat above, bent up on the edges in front 

 of the notch, deep, broad behind, rather shorter than the length of 

 brain-case. Teeth-line reaching nearly to the notch, large, three 

 in an inch. First and second cervical vertebras united by their 

 bodies ; the third, fourth, fifth, sixth, and seventh free. 



Vertebras 88 :— C. 7. D. 14. L. and C. 67. 



1. Lagenorhynchus albirostris. B.M. 



Lagenorhynclms albirostris, Gray, Cat. S. $ W. p. 272. no. 8; Synops. 

 Whales Sf Dolph. p. 8, t. 10. f. 2, t. 11 (skull) ; Gcrvais, Osteogr. 

 Cet. tab. 36. fig. 5. 



The beak of the skull once and one-half as long as the width at 

 the notch. 



Inhab. North Sea, Yarmouth. 



Tribe IV. PSEUD OR CAIN A . 



Head rounded in front, very convex, not beaked. Teeth conical. 

 Beak of the skull depressed, broad, scarcely so long as the brain- 

 cavity. 



12. PSEUDORCA. 



Pseudorca, Gray, Synopis. Whales <§- Dolph. p. 8. 



Head rounded, convex : body moderate ; dorsal fin moderate, in 

 the centre of the back ; arm-bones very short and thick, the hu- 

 merus rather the shortest. 



Triangle in front of the blowers flat. Teeth large, conical, acute, 

 permanent. Pectoral fin falcate. Arm-bone short, broad. Meta- 

 carpal bones five, close together. Fingers very unequal, second and 

 third much longer than the rest, six- or seven-jointed ; first finger 

 very short, two-jointed ; third finger short, four-jointed, rather 

 longer than the first two joints of the third finger. Tooth-line of 

 the upper jaw nearly to the notch ; of. the lower jaw rather shorter. 

 Lower jaw strong. Symphysis short, about as long as the space 

 occupied by the first four teeth. Teeth large, conical, simple. 



Vertebras 50 :— C. 7. D. 10. L. 9. C. 24. 



The first to the sixth cervical vertebra? united bv their bodies 



