2 



t 



\ 



the sides, and strongly keeled in the centre behind ; hinder edge of 

 blow-hole rather prominent. Intermaxillar wide, convex above, leaving 

 a rather broad open space in front. Palate rather concave in front, 

 convex in the centre behind, the hinder part keeled on each side. 

 Lower jaw thick, blunt, and rather produced beyond the upper in 



front. Skull rather compressed behind. Teeth -^, rather slender, 



cylindrical, conical at the top. The frontal ridge half the distance 

 between the notch and the convexity of the condyles ; condyles large, 

 rather oblique ; foramen magnum rather wider than high. 



in. lin. 



Length, entire 15 



of beak 7 10 



of teeth-line 6 10 



of lower jaw 11 11 



Width at notch 3 6 



at orbit 6 5 



at middle of beak 2 10 



of middle of intermaxillar . . 13 



■ at condyles above 3 3 



Height of each condyle 1 3 



Skull from notch 6 10 



Lagenorhynchus clanculus. 



Skull wide and rather high behind ; beak flat, outline wide at the base, 

 rapidly tapering and acute in front, but rather convex on the sides ; 

 sides slightly rounded, the hinder edge near the notch only slightly 

 turned up and rounded ; lower jaw high behind ; triangle extending to 



33 

 near the middle of the beak. Teeth -^^y small, cylindrical, curved, ra- 

 ther acute at the top ; the lower front one very small. Intermaxillaries 

 broad, hard. 



in. lin. 



Length entire 14 6 



of beak 7 3 



of skull 7 3 



■ of teeth-line 6 6 



of lower jaw 11 3 



of symphysis of lower jaw. . 1 4 



Width at notch 4 2 



at orbit 7 G 



• at middle of beak 2 7 



of intermaxillar in middle . 1 4 



of condyles above 2 10 



Hab. Pacific. 



Very peculiar for the elongation and reflexion of the beak before 

 the notch, and the regular beveling of the sides of the beak. 



Lagenorhynchus Thicolea. 



Skull rather narrow behind ; beak elongate, almost one-fifth longer 

 than the length of the head, rather dilated and concave above behind, 

 with the side edges in front of the notch elongated, keeled, and turned 



