354 Water Hog-Loufe or Sow . 
Fifhes, to breathe through, or regulate font© 
of the other animal Functions. And what 
feems to confirm this Opinion is, that on de¬ 
priving the Animal of them, the Circulation 
in the Legs ceafed indantly, though the 
Creatures lived for fome Time afterwards*. 
The Motion of the Valves, however uniform 
at any one Time, is not always of the fame 
Quicknefs, being now and then fo flow as 
nearly to beat Seconds, (when it is vifible, 
even by the naked Eye, in certain Pofitions 
of the Animal) whereas they move at other 
Times with above twice that Velocity. And 
this feems to be nearly in Proportion to the 
Temperature of the Weather, their Motions 
being always flowed in the coldeft Seafons. 
At b N° in. which is a Profile View of this 
Creature, the Valves are fhewn as they ap¬ 
pear when moving. Their working up and 
down continually, renders it difficult to b@ 
fare of the true Figure, or indeed the true 
Number of them ; but there feems to be 
four Pair, which move not all together but 
alternately. The external Pair feems drength- 
e'ned and fupported by a Couple of drong 
jointed Tendons, as is fhewn at N° u. b. 
The natural Size of this Animal when at 
its full Growth is about three Tenths of an 
Inch in Length. Its Motion, notwithftand- 
i'ng the great Number of its Legs, is very 
flovv, auk ward and unwieldy: and indeed the 
Length and Slendernefs of the Legs feem to 
render 
