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it, and he knows no more, than that he finds, fome- 
times, fwimming upon the furface of the water, 
wherein the phoca lives, a white froth ; and when 
lie takes it up, it dwindles away. This he fuppofes 
to be the menfes ; which I fuppofe to be a froth, 
brought on by the adion of the animal upon the 
fait and water, which are very fufceptible of fuch an 
effed. But, if a fhew-man gives out, that his ani- 
mal is a fea-lionefs, he will eafily report any other 
abfurdity. 
The different fpecies'of this clafs, or rather genus , 
of animals, are diftinguifhable, by their proportion, 
their fize, as to their full growth, their teeth, webb’d 
feet, and whatever other parts in fome may not be 
proper to others. 
As to the firft, this fpecies before us is fliorter and 
thicker in proportion than that I defcribed before ; 
which appears by the figure in the before-mention’d 
tranfadion ; and it may be depended on, that I was as 
exad as pofiible in taking its true proportion. Dr. 
Grew, in his excellent book of the Rarities , &c. men- 
tions a difference in the proportions of two which 
he defcribes, in their thicknefs * that prefented to the 
mufaeum by Mr. Haughton being thicker than the 
other. He alfo gives an account of another fpecies, 
which he calls the long-necked feal, in thefe words $ 
“ He is much flenderer than either of the former ; 
tc but that, wherein he principally differs, is the length 
“ of his neck ; for, from his nofe-end to his fore- 
<c feet, and from thence to his tail, are the fame 
u meafnre ; as alfo in that, inflead of his fore-feet, 
u he hath rather fins 5 not having any claws thereon, 
“ aa 
