Cesly, CRETACEOUS) FISH. 433 
Div. I. CETACEOUS FISH. 
ATURE on this tribe hath beftowed an in- 
ternal ftruéture in all refpects agreeing with 
that of quadrupeds; andin a few other the external 
parts in both are fimilar. 
Cetaceous Fifh, like land animals, breathe by 
means of lungs, being deftitute of gills. ‘This obliges 
them to rife frequently to the furface of the water to 
refpire, to fleep on the furface, as well as to perform 
feveral other functions. 
They have the power of uttering founds, fuch as 
bellowing and making other noifes, a faculty denied 
to genuine fifh*. : 
Like land animals they have warm blood, are fur- 
nifhed with organs of generation, copulate, bring 
forth, and fuckle their young, fhewing a {trong at- 
tachment to them. 
Their bodies beneath the fkin are entirely fur- 
rounded with a thick layer of fat (oul analos 
gous to the lard on hogs. 
The number of their fins never exceeds three, 
Viz. two pectoral fins, and one back fin; but in fome 
fpecies the laft is wanting. 
Their tails are placed horizontally or flat in refpect 
to their bodies; contrary to the direction of thofe 
of all other fifh, which have them ina perpendicular 
fite. This fituation of the tail enables them ta 
force themfelves fuddenly to the furface of the water 
* Pontop. Hift. Norun ii. 123. Blafius Anat. Animal, 288. 
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