PONTOPOllIAD^. 95 



2. Beluga Kingii. 



Beluga Kingii, Gray, Cat. S. ^ W. p. 309 ; Synops. Whales % Dolph. 

 p. 9, t. 7. 



Inhab. Australia. 



2. MONODON. 



Monodon, Grai/, I.e. pp. 231, 310; Synops. Whales 8f Dolph. p. 9. 

 Monoceros, Gray, Cat. S. 8f W. p. 393. 



Lateral expansion over the orbit shelving down. Teeth in both 

 jaws very early deciduous. Male with one, rarely two, very long, 

 projecting, spiral tusks in the left side of the upper jaw. Cervical 

 vertebrae : — first free, thin ; second and third united by the spinal 

 processes. Bladebone with large coracoid and acromion processes. 

 Fingers short. 



YertebrEe 50 :— C. 7. D. 11. L. 6. C. 26. 



" In the skeleton of two males in the Museum of the College of 

 Surgeons, the bodies of the second and third cervical vertebrae are 

 firmly united." — Floiver. 



1. Monodon monoceros. B.M. 



Monodon monoceros, Gray, I. c. p. 311 ; Synops. JVhales Sf Dolph. p. 9j 

 Gervais, Osteogr. Cet. t. 44. f. 6-9. 



Inhab. North Sea. 



Family 15. PONTaPORIAD^. 



Head long-beaked. Beak slender, smooth. Nostrils on the 

 nape, crescent-shaped. Teeth in both jaws permanent, conical, with 

 a swollen ring round the base. Dorsal fin short, trigonal. Pecto- 

 ral fin short, truncated. Fingers 5, nearly equal ; the thumb very 

 short, of one joint ; the index finger the longest, the rest gradually 

 shorter to the little finger. Bladebone broad, with two ridges. 

 Skull long-beaked, the beak compressed. Lower jaws united to- 

 gether nearly to the base. Cartilages of ribs ossified. 



Vertebrae 42 :— C. 7. D. 10. L. 7. C. 18. 



1. PONTOPORIA. 



Pontoporia, Gray, Cat. S. ^ W. pp. 230, 231 & 393 ; Synops. Whales 

 Sj- Dolph. p. 5; Flower, Trans. Zool. Soc. vi. p. 87 ; Burmeister, An. 

 Mus. P. Buenos Ayres, p. 389. 



Stenodelphis, Gervais, 1847. 



Beak of the skull high, compressed. Symphysis of the lower jaw 

 very long. 



