3S2 Mr. Hunter’s Obfervatlons on the 
requiring a fkin to be thrown over the fkeleton to make the 
fpecies known ; but this is not fo decidedly the cafe with this 
order of animals, for the fkeleton in them does not give us the 
true fhape. An immenfe head, a fmall neck, tew ribs, and 
in many a fhort fternum, and no pelvis, with a long fpine, 
terminating in a point, require more than a fkin being laid 
over them to give the regular and charadteriftic form of the 
animal. 
The bones of the anterior extremity give no idea of the 
fhape of a fin, the form of which depends wholly upon its 
covering. The different parts of the tkeleton, are fo inclofed, 
and the fpaces between the projecting parts are fo filled up, as 
. to be altogether concealed, giving the animal externally an 
uniform and elegant form, relembling an inledt enveloped in 
its chryfalis coat. 
The bones of the head are in general fo large, as to render 
the cavity which contains the brain but a fmall part of the 
whole ; while, in the human fpecies, and in birds, this cavity 
conftitutes the principal bulk of the head. This is, perhaps, 
moft remarkable in the Spermaceti Whale; for on a general 
view of the bones of the head, it is impoffible to determine 
where the cavity of the fkull lies, till led to it by the foramen 
magnum occipitale. The fame remark is applicable to the 
large Whalebone and Bottle-nofe Whale: but in the Porpoife, 
where the brain is larger in proportion to the lize of the ani- 
mal, the fkull makes the principal part of the head. 
Some of the bones in one genus differ from thofe of ano- 
ther. The lower jaw is an inlfance of this. In the Sperma- 
ceti and Bottle-nofe Whales, the Grampus, and the Porpoile, 
the lower jaws, efpecially at the pofferior ends, referable each 
other ; 
