8 CETACEANS. 
different species. In colour it may vary from black to creamy white; while in 
some cases it is ornamented with stripes of dark and light. The object of the 
baleen, as already said, is to strain the water from the small animals on which the 
whale feeds; and its mode of action is described by Sir W. H. Flower as follows :— 
“In feeding, the immense mouth is filled with water containing shoals of these 
small creatures, and then, on the whale closing the jaws and raising the tongue, so 
as to diminish the cavity of the mouth, the water streams out through the narrow 
A 
Mane 


Sec! 
MEDIAN SECTION, SHOWING THE LEFT SIDE OF THE SKULL OF THE GREENLAND WHALE, 
WITH THE WHALEBONE, 
Br, brain-cavity ; J,J* upper and lower jaws ; bo, bones of roof of skull; s, blow-hole, 
with arrows leading from the cavity of the nostrils; w, whalebone: ¢, contour of tongue ; 
n, aperture of nerve canal in lower jaw. (From Southwell’s British Seals and Whales. 
—After Eschricht. ) 
intervals between the hairy fringe of the whalebone blades, and escapes through 
the lips, leaving the living prey to be swallowed.” 
The whalebone whales are commonly divided into right-whales, 
humpbacks, and rorquals or finners, severally representing as many 
genera, in addition to which there are two less well-known forms, each of which is 
entitled to generic distinction. 
Various Kinds. 
RiGHT- WHALES. 
Genus Balcena. 
The right-whales, of which the Greenland whale is the best known repre- 
sentative, are characterised by the absence of any fin on the ‘back, and of any 
furrows in the skin of the throat; and likewise by the proportionately large size 
of the head, and the arched form of the sides of the mouth, which ascends in the 
middle far above the level of the eye. The flipper is relatively short, and contains 
five distinct digits; and the whole of the seven vertebrae of the neck are welded 
together into a solid mass. The baleen is long, narrow, very elastic, and black 
in colour. 
