Animalcules with Shells and Wheels . 301 
ones hanging to them: but they are fre¬ 
quently without any at all, like the Figures 
4 and 8. 
The third Species of cruflaceous Animals 
with Wheels, fhewn fig. 11, 12, 13. is re¬ 
markably different from the former two in 
the Shape and Fafhion of its Shell, which 
extends on either Side a curved or hooked 
Procefs, that bending towards the Tail, in¬ 
ward, ends in a fharp Point, and is within a 
fourth as long as the Tail itfelf,—The Head 
Part of the Shell differs alfo from thofe be¬ 
fore deferibed, in the Order and Difpoiition. 
of the Spicula , of which-it has four longer 
and two fhorter ones, placed as i nfig. 13. 
where by the Body’s being contracted and 
drawn confiderably within the Shell, as fre¬ 
quently is the Cafe, the Top of the Shell 
is perfeHly diflinguifhable, and its Spicul<z 
plainly feen. 
The Tail of this Creature has the like 
Figure, Articulations and Motions with that 
of the other Species : and its Body may pro¬ 
perly be divided in the fame Manner as 
theirs, though in Shape it appears fomewhat 
different through the Shell, which the 
Drawings exprefs fufficiently without any 
particular Defcription. 
From its Plead two Arms or Branches are 
frequently extended, and the circular End 
of each is furnifhed with a Border of Fibril - 
Iwt feeming at fome Times to have a very 
quick 
