94 BELUGIILE. 



" The Narwhal and the Beluga appear to separate themselves 

 from all the rest, hy certain well-marked structural conditions, 

 especially the characters of the cervical vertebrae. As these two 

 animals are in almost every part of their skeleton nearly identical, 

 even to the number of the vertebras and phalanges, I am disposed to 

 look upon the exceptional dentition of the former as au aberration of 

 secondary importance, and to unite the two genera into a distinct 

 subfamily, placing it next to the Platanistidae." — Flower, I. c. p. 114. 



1. BELUGA. 



Beluga, Gray, Cat. S. $ W. pp. 231, 306, 393 ; Synops. Whales 8c 

 Dolph. p. 9. 



Lateral wing of the maxilla over the orbit shelving downward. 

 Teeth conical in both jaws, early deciduous. Male without any 

 spiral horn-like tooth. Fingers short. Metacarpal bones surrounded 

 with cartilage. Bladebone with large coracoid and acromion pro- 

 cesses. Second cervical vertebra with a large dorsal process. 



Vertebras 50 :— C. 7. D. 10. L. and C. 33. 



1. Beluga catodon. B.M. 



Beluga catodon, Gray, I. c. p. 307, fig. 61 ; Synops. Whales 8f Dolph. 



p. 9, tab. 29. f. 3 (tongue). 

 Delphinus canadensis, Gray, Synops. Wales 8/ Dolph. t. 5 (head false, 



with beak). 

 Beluga albicans, Gervais, Osteogr. Get. t. 44. f. 1-5. 

 Delphinapterus, Lucas, Vidensk. Selsk. Skr. Raekke 5, Band ix. tab. 8 



(skull and teeth, showing how they are worn). 



Inhab. North Sea, mouths of rivers. 



1. Beluga rhinodon, Cope, Proc. Acad. Nat. Sci. Philad. 1865, p. 5, 



1869, p. 13, fig. 1. 



Inhab. Arctic seas. 



2. Beluga declivis, Cope, Proc. Acad. Nat. Sci. Philad. 1865, p. 5, 1869, 



p. 14. 



Inhab. Arctic seas. 



3. Beluga angustata, Cope, Proc. Acad. Nat. Sci. Philad. 1869, p. 20, 



figs. 2 & 3. 

 Beluga concreta, Cope, Proc. Acad. Nat. Sci. Philad. 1865, p. 5. 



Inhab. Arctic seas. 



These are probably varieties of B. catodon, showing that the at- 

 tachment of the cervical vertebras, the number of ribs, and the form 

 of the acromion are liable to vary. 



4. Beluga canadensis, Wyman, Proc. Bost. Soc. Nat. Hist. 1865. 



Inhab. Canada. 



I believe it to be the same as the former. 



