Zoological Society. 49 



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 G 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 -^ small, cylindrical, curved, ra- 

 ther acute at the top ; the lower front one very small, lntermaxillaries 

 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 6 



at middle of beak 2 7 



of intermaxillar in middle . 1 4 



— of condyles above 2 10 



Hah. Pacific. 



Very peculiar for the elongation and reflexion of the beak before 

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



Lagenorhvnchus 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 

 up ; the middle of the beak flat, with flat shelving sides, the shelving 

 part being broader, and forming a slight keel in front. lntermaxillaries 

 flat, graduallv tapering. Triangle to the middle of the beak concave on 



Ann. $ Mag. N. Hist. Ser. 2. Vol. v. 4 



