2j$ Of the Wheel Animal. 
of the Wheel or Funnel were of fome 
Thicknefs, and had two Rows of Gogs or 
Teeth, one above and the other below that 
Rim. 
When the Wheels appear in Motion, 
the Head feems large in Proportion to the 
Size of the Animal; and tho’ it is then 
every where tranfparent, a Ring or Circle, 
more particularly remarkable for its Clear- 
nefs, may commonly be perceived about the 
Middle of the Forehead, a little above the 
Mouth. [See fig. 5. m.J I ill all not pre¬ 
tend to call this the Seat of the Brain, 
though its Situation and Appearance would 
perhaps jollify fuch a Suppofition; but as I 
am fully fenfible how very eafy it is for me 
to be miftaken, I am extremely fearful of 
leading others into Miftakes. Many Veflels 
which feem to take their Origin from hence 
are difcernible in the Head, wherein fome 
tranfparent Fluid appears continually agitat¬ 
ed with a Sort of fluctuating Motion. All 
thefe Veflels and every Part of the Plead are 
capable of great Diflention and Contrac¬ 
tion, and frequently alter their Figure. 
The Thorax or Bread b 5 is joined to the 
Head by the Interpofltion of a fhort an¬ 
nular Circle or Neck c 9 which is very 
plainly diftinguiihed when the InfeCt is 
.ftretched out, and is working with, its 
Wheels. This Thorax is nearly one fixth 
Part of the whole Animal, and deferves the 
A - t moft 
