272 Of the Wheel Animal, 
this Condition, the Animal is often feen to 
unfaflen its Tail, and fwim along with a 
great Deal of Swiftnefs, feemingly in Purfuit 
of Prey. Vid.Jig, 3. 
The Subftance of this Animal feems to 
he chiefly mufcular, every Part thereof be* 
ing capable of great Diftention and Con¬ 
traction. It has likewife a confiderable De¬ 
gree of Tranfparency, v/hereby the Syftole 
and Diaflole of its Heart, and the periftaltic 
Motion of the Inteftines, are rendered plainly 
vifible: and a Kind of Undulation may be 
perceived every where within it. It appears 
Itrong and vigorous in Proportion to its Size, 
and leems almoft continually hunting after 
minute Animalcules or other little Bodies 
wherewith the Waters abound. 
Fig, 1. fhews the Form of the InfeCt 
under Examination, when it appears 
like a Worm or Maggot, and fully ex¬ 
tends its Body. Sometimes in this 
Condition little Spicules appear darted 
out at the Head End, with a Sort of 
vibrating Motion ; the Snout is alfo 
fometimes more flat, and fharper at 
other Times, than reprefen ted here. 
Fig, 2. deferibes the Manner of its 
moving from Place to Place whilfl in 
the Maggot Form, by bringing the 
Head and Tail nearly together; then 
firetching the Body out, fixing the 
Head 
