4 The Hijiory of ANIMALS. 
and frequently will turn round with great rapidity, moving progreffively forward at 
the fame time. 
It is common in ditch water. A third magnifier fhews it very diftincftly. 
Cyclidium corpora elliptico . 
The Cyclidium , with an elliptic body . 
This is one of the larger Animalcules. It is of an elliptic, or, as we are apt to ex* 
prefs it, an oval figure : it’s length is about once and a half it’s diameter, and both ends 
are equally large and obtufely rounded : it’s colour is a dufky brown, with a call of 
the olive ; it’s fkin is not fmooth, but as it were granulated, and the traces of the in- 
teftines are very vifible in it. It is confiderably tranfparent, and ufually appears flat- 
tifh, fometimes more diftended ; it is very quick in it’s motions, which are always firffc 
fideways, and then progrefiive. 
It is frequent in the infufions of vegetable bodies, particularly in a cold infufion of 
bruifed henbane feeds. In the film that appears after three or four days on this infu¬ 
fion, they are fo amazingly numerous, that a little drop of it (hews to the third mag¬ 
nifier, of a double microfcope, many hundreds of them rolling over one another. 
Cyclidium corpora ovato. 
The Cyclidium , with an oval body . 
This is not of the number of the fmallefi: of the Animalcules, though much infe¬ 
rior in fize to the former. It is of a tolerably regular ovate figure, reprefenting a 
hen’s egg in miniature ; both ends are rounded, but that where the head is fituated is 
much fmaller than the other. The furface of the whole Animalcule is perfectly 
fmooth; it’s fkin colourlefs and pellucid, and the traces of the inteftines are eafily 
diftinguifhed in it, in form of roundifh, aggregated fpots, which refledt a variety of 
colours in moft lights. It is not very nimble in it’s motions j a fecond magnifier 
fhews it very diftin&ly. 
It is found not unfrequently in ditch water, but much oftener in the cold infufions 
of vegetables, as in that of white poppy feed. 
PARAMECIA. 
A NIMALCULES which have no vifible limbs or tails, and are of an irre¬ 
gularly oblong figure. 
Paramecium corpore fublongo, utrinque obtufo , volubili. 
The Paramecium^ with an oblongs voluble body : obtufe at each end\ 
This is of the number of the larger Animalcules. It is of an oblong figure j it’s 
length is equal to about three times it’s diameter, and it’s colour a very pale brown, with 
a faint admixture of greenifh. The head and tail are both obtufe, but they are fmaller 
than the reft of the body: the fkin is thin, fmooth, and tranfparent, and the traces 
of the inteftines are diftindtly vifible through it. It is tolerably fwift in it’s motions, 
and is able to twift and turn about it’s body, and to double and fold it up in various 
manners, fo as to appear of a very different fhape from it’s real one and it has hence 
unluckily impofed upon many of the microfcope obfervers, who have figured it as of 
different fpecies under this diverfity of appearances. 
It is not uncommon in ditch water $ a third magnifier in the double microfcope 
fhews it very diftindly. 
Paramecium corpore fublongo, caput verfus attenuato. 
The Paramecium, with an oblong body , fmallefi toward the head . 
This is not of the fmallefi: kind of Animalcules. It’s length is about three times 
and a half it’s diameter j it’s hinder extremity is large and rounded, from this it 
grows gradually fmaller all the way, but particularly near the head $ it is much flenderer 
than 
