THE ORDER CETACEA. 183 



jaw. In many of its characters it resembles the Delphi- 

 nus Tursio, but in others it is so different that it may 

 very properly be considered as a distinct species. The 

 forehead is convex and rounded. The snout is slender 

 and flat; and the upper jaw is flat and ends in a beak 

 somewhat like that of a duck. The teeth are placed at 

 the anterior extremity of the lower jaw. The pectoral 

 fins, which are of an oval form and small for the size of 

 the body, are placed opposite to the angles of the 

 mouth. The place of the dorsal fin corresponds to the 

 origin of the tail, is spear-shaped, pointed, and inclines 

 backwards. The tail-fin is divided into lobes, forming 

 by their union a crescent. The lower part of the body 

 is of a light brown colour ; the upper part is brownish- 

 black. This species is supposed to be from thirty to 

 forty feet long. 



SPECIES VI. 



DELPHINUS FERES. 



In this species there is one fin on the back. The head 

 is rounded and nearly of the same height as the length. 

 It is very thick at the top, and, suddenly diminishing 

 towards the anterior part, ends in a short round snout. 

 The jaws are equal in length ; they are covered with 

 membranous lips, and are furnished internally with a 

 row of oval and obtuse teeth : twenty have been reckoned 

 in each jaw. The form of the teeth constitutes the dis- 

 tinctive character of the species. The large and small 

 teeth are equal in number. The largest are above an 

 inch long, by half an inch broad. The small teeth are 

 only five or six fines in length. 



