26 M A M M A L G Y. 



dition, but the following short note hy Mr. Peale is our only informa- 

 tion relating to it : 



"This species inhabits the Antarctic Ice. The specimen was ob- 

 tained on the 10th of March, at Deception Island. It appears from 

 the teeth to be an adult, and is the most perfect specimen brought 

 home by the Expedition." 



« 



2. Genus CYSTOPHORA, Gro^/ F 

 1. Ctstophora, ? 



We find in Dr. Pickering's journal, the following notice of the ap- 

 pearance of an animal of this family, on the coast of South America, 

 between Rio de Janeiro and the Rio Negro. This notice is of higli 

 interest on account of locality : 



"1839, January 20th. At nine A.m., a Seal appeared about the 

 bows of the vessel, easily keeping ahead, and frequently coming to the 

 surface. Our distance from the nearest land was one hundred and 

 thirty-five miles, though the water was green, as if on soundings. 



" When swimming below the surface this animal might almost have 

 been mistaken for a Shark, except that its body was much more flexi- 

 ble in turning, and another remarkable difference was, that it, appeared 

 to swim entirely by means of its pectoral flippers, the tail being ex- 

 tended and apparently inactive." 



