QUADRUPEDS. 209' 



the teeth of the porpess are loose in their sockets, while 

 others assert that they are fixed, the former having examin- 

 ed old, the latter young individuals, or even different parts 

 of the same jaw, the middle teeth being fixed, the others 

 loose. 



With a dorsal fin. 



121. Delphinus. Teeth numerous in both jaws. This 

 is an extensive genus, which Cuvier has proposed to sub- 

 divide into the beaked species (Delphinus), and the short- 

 nosed species (Phocsena), the former represented by the 

 Dolphin, the latter by the Porpess. 



At Plate I. fig. 4. there is a representation of the Por- 

 pess, D. plioctzna. Fig. 5. represents the teeth, a one in 

 the middle of the lower jaw, and h one in the middle of 

 the upper jaw. Among the British species, some have 

 compressed and obliquely placed teeth, as \\\e plioacna^ — 

 subulate, as the dclphis, — conical, as the orca and melas *, 

 — and truncated, as the truncaius. It is probable, that 

 the incisors in the upper jaw are limited to two, as in the 

 porpess. 



122. Hyperoodon. Bottle-nose. Two small teeth in 

 front of the lower jaw. //. hidens. See Hunter, Phil. 

 Trans. 1778, Tab.xixf. 



No dorsal fin. 



123. Delphinaptera. Belug-a. D. albicans. This 

 whale is remarkable for the whiteness of its skin, all the 

 others being black on the upper parts. (Score sby, Arc. 

 Reg. Tab. xiv. 



■ The Delphinus gangeticus of Roxburgh (Asiatic Researches, vol. vii., 

 and Phil, Trans. 1818), belongs to this group. 



-|- HuNTRR gives the lower jaw in one place, and the upper in another, as' 

 the station of the teeth, 



VOL. II. O 



