28B Of the Wheel Animal . 
various Directions, for two or three Hours* 
in the Water, and probably filled its Belly, 
(during which Time its Tail remains fatten¬ 
ed to fome Dirt or Slime, or to the Slip of 
Glafs it is placed upon,) one fhall perceive 
it, by Degrees, moving them with lefs Vi¬ 
gour, and at latt drawing them quite within 
the Head, The Head and included Wheels 
fink dowp then very fiowly into the Thorax, 
the Belly fwells, and the Whole appears like 
fig' IO - 
Soon after, the Thorax alfo (which now 
contains the Head and Wheels) is drawn 
within the Belly, and below the annular 
Circle at the Top of it, as fig. ix. repre- 
fents. 
The faid annular Circle then contracts, 
and its Sides come together like the Sides 
of a Purfe when the Strings are pulled, 
clefing over the Head and Thorax, which, 
new, filling the upper Part of the Belly, 
make it nearly round, likeyfg*. 12. 
In the laft Place, the three upper Joints 
of the Tail come down over the lower joint, 
which becomes fixed ; immediately the Belly 
alfo finks, or is pulled down, and inclofes 
the whole Tail. All the Parts being now 
included in the Belly, which becomes their 
Cafe or Covering, it fwells into a round 
Ball, lies without any Motion, and appears 
confiderably opake. (Vid.fg. 13.) It ttiil 
adheres however by the Tail; 
Some- 
9 
