ORDER CETACEA. 437 



The Beluga. (Delph. Leucas, Gnu.) 



Nine teeth throughout, thick and blunt at the 

 end ; spine of a yellowish white ; as large as 

 the Grampus. Found in all the Icy Sea, whence 

 it often ascends pretty high into the rivers. 



The Hyperoodontes, (Lacep.) 



The body and muzzle are conformed like those of 

 the Dolphins proper ; but there are only two small 

 teeth in front of the lower jaw, which do not always 

 appear externally. In the palate are many small 

 tubercles. 



Only one species is known from twenty to five- 



and-twenty feet in length, and perhaps more. 



It is taken in the North Seas, and is often named 



the Beaked Whale. 



The Narwhals (Monodon, L.) 



Have no teeth, properly speaking, but only long, 

 straight, and pointed tusks, implanted in the in- 

 termaxillary bone, and directed in the line of the 

 axis of the body. The form of the head and body 

 much resemble that of the Porpusses. 

 Only one species is well known. 



Monodon Monoceros, Lin. {Lacep. IV. viii.) 



The tusk of this animal, furrowed into a spiral 

 form, is sometimes ten feet long, and for a 



