116 CETACEAN GALLERY. 



is exhibited which was captured in the Chinese river Yang-tse-kiang, 

 nearly a thousand miles from the sea. 



Orca. Very different in structure and habits from the last is the 

 genus Orca, containing the " Grampuses " or " Killers " ; powerful 

 animals, with numerous formidable teeth, high-pointed dorsal fin, 

 and very broad rounded nippers. They are found in almost all 

 seas from Greenland to Tasmania, and are distinguished from all 

 their allies by their ferocity, being the only Cetaceans which 

 habitually prey on warm-blooded animals; for though fish form 

 part of their food, they also attack and devour Seals arid various 

 species of their own order, not only the smaller Porpoises arid 

 Dolphins, but they also combine in packs to hunt down and destroy 

 full-sized Whales, as wolves do the larger ruminants. 



A life-sized model of a fine female specimen caught at the mouth 

 of the Humber, in November 1885, is exhibited near the entrance 

 to the gallery, and near the further end are the skeletons of this 

 same female and of a male from Bildoen Island, Norway. 



Orcella. O.fluminalis is a small species found in the Irawaddy 

 river, from 300 to 900 miles from the sea, of which a perfect 

 skeleton is exhibited. 



Delphinapterus. D. leucas, the Beluga, or White Whale, so called 

 from its almost pure white colour, is about 12 feet long, abundant 

 in the Arctic seas, and extends as far south on the American coast 

 as the river St. Lawrence, which it ascends for a considerable dis- 

 tance. On rare occasions it has been seen on the coast of Scot- 

 land. It has no dorsal fin. 



Monodon monoceros. The Narwhal, or Sea-Unicorn, resembles 

 the Beluga closely in everything but its teeth, as will be seen by 

 comparing their skeletons. Its dentition is, however, perhaps the 

 most extraordinary of any mammal. It has only two teeth in the 

 adult, both of which lie horizontally in the upper jaw. In the 

 female both remain permanently concealed within the bone of 

 the jaw, so that this sex is practically toothless ; but in the male, 

 while the right tooth remains similarly concealed and abortive (as 

 shown in the skeleton by removal of part of the bone which covered 

 it), the left is immensely developed, attaining a length equal to 

 more than half that of the entire animal, projecting horizontally 

 from the head in the form of a cylindrical or slightly tapering 



