AV. ‘AND REVIVED. 145 
‘great relation to wheel animals, which may af- 
ford a ftrong corroboration of the faé&. Such is 
-an animal often found on the tremella, fhorter 
-and a little thicker than the wheel animal. The 
pofterior part .is.provided with two diverg- 
ing filaments, with which it fixes itfelf to any 
fubftance. At the anterior part are long flender 
fibrils, occafioning a vortex in the water when 
the animal puts them in motion, fig. 6. There 
. Js no motion when the fibrils are at reft. While 
moving, and during the continuance of the vor- 
tex, a particle, A, fimilar in figure to that we 
peak of in the wheel animal, is feen almoft in 
‘the centre of the animal.: it alternately contradts 
and dilates, but motion ceafes with ceflation of 
the vortex. This difference only is to be re- 
marked; the particle of the wheel animal is 
formed by two femicircular cavities, whereas that 
_ in the tremella animal refembles a.bladder oy fel- 
liculus. The particle and canal, towards the xe- 
gion of the head, are connected, as in the wheel 
animal, by a fhort duct, B, terminating at the 
mouth of the animal, and at the oppofite extre- 
mity it enters another folliculus, C, which not 
only moves with alternate.contraGtion and dila- 
tion, but undulates like a wave-at reft. This 
folliculus is precifely the receptacle of the ali- 
ments. It is always full of a yellowifh green 
matter, which, from time to time, proceeds from 
Vou. IT. K the 
