THIRD SUBDIVISION. 203 



A. Includes those which have no dorsal fin. 



Genus a. Having the head globe-shaped. Beluga. 

 6. Having a slender beak. Delphinapterus. 



B. Includes those which have a dorsal fin. 



Genus c. Having the head globe-shaped. Globiceps. 



. d. With a short snout, uniformly rounded. Pho- 



caena. 



e. With a snout and a distinct beak. Delphinus. 

 f. With a much longer snout and beak, and having 



no furrow between them. Delphin&rhyncus. 

 g. Without a snout and with a long beak. Soosoo. 

 h. Having a long beak bristled with hair, and both 



incisor and molar teeth. The Inia. 

 i. Having two dorsal fins. Oorypterus. 



On this classification we would simply remark, 

 that we have not at all innovated, hut only followed 

 what has already been introduced by able and cele- 

 brated naturalists. It would be an easy matter to 

 state objections to this arrangement, more particu- 

 larly perhaps to its nomenclature, and to demonstrate 

 that it is susceptible of improvement. We feel, 

 however, that we are not the parties to attempt this 

 improvement, which moreover should not too hastily 

 be effected. We consider the above a great stretch 

 and improvement upon any that has yet been offered 

 to the British public. The characters, taken from 

 the fascial line, are conspicuous on the slightest 

 inspection, and we believe they are for the most 

 part fixed and certain. The majority of them are 

 exhibited on Plate i. s, the Globiceps ; , the Por- 

 poise; w, the Dolphin; ?, the Delphinorhyncus ; 

 9V, the Soosoo. 



We now proceed to the genus Beluga. 



