32. Guide to Whales, Porpotses, and Dolphins. 
includes two groups, in the first of which there is no distinct beak. 
This group comprises the Porpoise (Phocena), the species of 
Cephalorhynchus, the estuarine Dolphins of the genus Orcella, 
the Killer (Orca), False Killer (Pseudorca), Pilot-Whale (Globi- 
cephalus), and the Dolphins of the genera Grampus, Feresia, and 
Lagenorhynchus. 
In the second group of the Delphinine the fore part of the 
head is prolonged into a distinct beak, marked off from the fatty 
elevation in front of the blow-hole by a V-shaped groove. None 
of the species exceed ten feet in length. The majority feed on 
fish, for the capture of which their long narrow beaks, armed with 
numerous sharp teeth, are well adapted; but a few appear to 
devour molluscs and crustaceans. For the most part they asso- 
ciate in large shoals; and although the majority are marine, a few 
habitually dwell in large rivers like the Amazon. This group 
includes the true Dolphins (Delphinus), Bottle-nosed Dolphins 
(Tursiops), and numerous long-beaked species of the genera Pro- 
delphinus, Steno, and Sotalia. 
White The Beluga or White Whale (Delph inapterus leucas) is 2 
well-known species, occurring in large herds, or “ schools,” 
Whale. throughout the Arctic Seas. Together with the Narwhal, 
it constitutes the subfamily Delphinapterine, which differs from 
other Delphinide in having all the vertebre of the neck free. On 
the east coast of America the White Whale is found so far south 
as the Gulf of St. Lawrence, sometimes ascending that river as 
high as Quebec. It is abundant in the White, Kara, and Okhotsk 
Seas, and enters the mouths of all the large Siberian rivers, in- 
cluding the Amur, and also the Yukon in Alaska. Accidental 
stragglers have been met with off Norway, and more rarely on the 
coasts of the British Isles. This Whale, which is of a uniform 
glistening creamy white colour, feeds on fishes of considerable size, 
cephalopods, and crustaceans, and its skin is the principal source 
of the so-called ‘ porpoise-hide”’ extensively used for shooting 
boots and boot-laces. 
It is represented in the room by a skeleton upon which a half- 
model has been constructed. The skeleton itself came from Green- 
land. On some occasions enormous numbers of these Cetaceans 
are slain, especially in Alaska; specimens have occasionally been 
seen on the coasts of Scotland. This species, like the Narwhal, 
has no back-fin. 
