DOLPHIN PROPER. 57 



situated in the flesh near tlie extremity of the diges- 

 tive canal, are the only vestiges of inferior extremi- 

 ties. Some have a dorsal fin, which is tendinous 

 and not connected with the skeleton. 



Some of these animals have conical teeth, all of 

 the same sort, arranged along the edges of the jaws; 

 others have only horny layers, projecting from the 

 roof of the mouth, well known hy the name of ba- 

 leen, though generally and inaccurately called 

 whalebone. 



The eyes, which are flat anteriorly, have a very 

 thick and solid sclerotica or external coat. The 

 tongue is covered hy soft and thick integument. 

 The stomach has from five to seven distinct pouch- 

 es, and instead of one spleen, there are several, 

 which are small and lobular. 



Tribe I. — Delphinus; L. Dolphin Proper; 0. 



Having teeth in both jaws, always simple and 

 almost always conical. They have the mouth form- 

 ed in advance of the head, by a sort of beak, small- 

 er than the rest of the head. They are destitute 

 of coecum. 



Vol. III.™— 8 



