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CHAP. VIII. 
Animalcules with Shells and Wheels ♦ 
i 
I N the Summer of the Year 1745, I firft 
took Notice of three Sorts of Wheel Ani¬ 
mals* having Shells, which I found herding 
together in the Water of the Ciftern in the 
Garden of Somerfet Houfe , and have feen 
fmce in other Waters. The firll of them is 
reprefented by the Figures 4, 5, 6 : the fe- 
cond Sort by thofe 7, 8, 9, 10: and the 
third Sort are marked n 2 12, 13. Plate 
XII. 
The firll Sort when extended is in Length 
about twice its Breadth. It is contained in a 
Shell, whofe Fore-part or End is armed with 
four very long Spikes on one Side of its 
Rim, the other Side whereof has no Spikes, 
but is waved or bent in two Places, much 
like the Form of a Turkifh Bow: vid. 
Jig. 6. The pofterlor End has a large cir¬ 
cular Hole through which the Tail is put 
out. By this Tail it fallens itfelf to any 
Thing it meets with, when it intends to fet 
the Wheel-work at its Head in Motion; 
but in fwimming, and at all other Times 
when it is not fixed by it, it wags this Tail 
backwards and forwards as a Dog does his, 
* Thefe are called Wheel Animals, from their refembling 
(he foregoing in fome Particulars. 
U 4 and 
