ANIMALCULE. 
lemrue, and moves veryflowly. The body is round, of a 
very dark-green, the fore-part bluntly rounded off, and 
the hinder-part fomewhat tapering, but finifhed with a 
round end. 4. The funilis, with moveable inteftines, is 
found in water that has been kept for feveral months : it 
is of an egg-fhape, and generally moves very quick, either 
to the right or left. 5. The ferotina, with immoveable in¬ 
teftines, is of an oval figure, partly cylindrical, the fore¬ 
part fmaller than the hind, with a black margin, full of 
grey vehicular molecules : it moves very (lowly. 6. The 
nebuloja , with vifible moveable inteftines, is found in the 
fame water with the cyclidium glaucoma, but is much 
more fcarce. The body is egg-fhaped, the fore-part nar¬ 
row, and frequently filled with opaque confufed inteftines. 
7. Th e feminu/um is found in water that has been kept for 
(bine days, and moves by afcending and defcending alter¬ 
nately. It is of a cylindrical figure, twice .as long as 
broad. Sometimes it is obl'erved fwimming about with 
the extremities joined together. 8. The intermedia , with 
a blackifh margin, is one of the fmalleft animalcules: it 
has a tranfparent body, without any vifible inteftines. 9. 
The cvulicm, is tranfparent, round, and egg-fhaped. A 
very ftrong magnifier difeovers fome long foldings on the 
furface, with bright molecules. 10. The pirum, with the 
hinder part tranfparent, has the fore-part protuberant and 
filled with molecules. The hinder-part is fmaller and emp¬ 
ty, with moveable molecular inteftines. 11. The (remula 
was found in an infufion with the paramaecia aurelia, and 
many other animalcules. It is among the lead: of thefe 
minute creatures, and is of a cylindrical figure and gelati¬ 
nous texture. Two of thefe creatures may at times be leen 
to adhere together. 12. The conjlribla, with a ftriCture 
in the middle, is found in falt-water, and is of a very fmall 
iize, and of an oval fhape. 13. The ellipiica, with a con¬ 
geries of green inteftines, is found among the green mat¬ 
ter on the (ides of veflels in which water has been kept for 
fome time. They are generated in fuch numbers, that 
myriads may fometimes be found in one drop. 14. The 
fu/iis, with both ends truncated, was found in water called 
pure, and had a languid motion. The body is round and 
tranfparent, with the fore and hind parts fomewhat fmall¬ 
er than the reft. 15. The fritillus, with the fore-part 
truncated, is found in an infufion of grafs and hay, and runs 
backward and forward through the drop with a wavering 
motion. 16. The caudata, with a kind of tail, is but fel- 
dom met with. The body is grey and tranfparent, with 
globular molecules. 17. The epijiomium, with the fore¬ 
part (lender and roundifh, is among the fmaller animal¬ 
cules. 18. The gcmmatci is found in ditch-water where 
the lemna thrives. It moves (lowly, and generally in a 
ftraight line. 19. The rctrograda moves commonly fide- 
ways, and fometimes in a retrograde manner. It has age- 
latinous tranfparent body, thicker in the middle than at 
the ends. 20. The fcjiinans , with obtufe ends, is found 
in (ea-water, and has a quick vacillatory motion from one 
fide to the other. The body is round, and the fore-part 
tranfparent. 21. The farcimen was found by Joblot in an 
infufion of blue bottles, moving very (lowly in an undu- 
latory manner. The body is cylindrical, about four times 
as long as broad, and truncated at both ends. 22. The 
index is found in water with the lemna minor; the body 
opaque, of a grey colour, and long conical (hape : the 
lower end is obtufe, one fide projecting like a finger, with 
two very fmall projections from the lower end. 23. The 
truncus, with a kina of head, is the larged of this kind of 
animalcules. The body is grey, long, and mucous ; the 
fore-part globular, the hinder part obtufe ; but it can 
alter its (hape confiderably. 24. The larva is long, round, 
and filled with molecules. The fore-part is obtufe and 
tranfparent, with a kind of neck or (mail contraction 
formed near the end. 23. The J'patula, with the fore¬ 
part tranfparent, and of the (hape of a fpatula. It is per¬ 
fectly cylindrical, and eryftalline. It moves in a wavering 
kind of manner, retaining its general form, but moving 
the fpatula in various ways. 26. The pupula, with the 
719 
fore-part papillary, is found in dunghill water in Novem¬ 
ber and December : it has a rotatory motion on a longi¬ 
tudinal axis, and moves in an oblique direction through 
the water. 27. The pupa, with a fmall nipple proceed¬ 
ing from the apex, has a’very llow motion, and refembles 
the former. 
V. Vibrio : A very fimple, invifible, round, and ra¬ 
ther long, worm. 1. The lincola is found in moil vegeta¬ 
ble infulions in fuch numbers, that it feems to fill up al- 
molt the whole of their fubftance. It is Co fmall, that 
with the beft magnifiers we can difeern little more than an 
obfettre tremulous motion among them. 2. The rugula 
is like a bent line ; and fometimes draws itfelf up in an 
undulated fhape, at others moves without bending the 
body at all. 3. The bacillus, equally truncated at both 
ends, is found in an infufion of hay. It is from lix to ten 
times longer than the monas lens, but much more (lender. 
4. The undula, is a round, gelatinous, undulating line. 
This is the animal which Leevvenhoeck fays is lefs than 
the tail of one of the feminal animalcules. It never ap¬ 
pears ftraight ; but when at reft it refembles the letter V. 
and when in motion the letter M. It commonly refts on 
the top of the water. 5. The fa pens, with obtufe wind¬ 
ings or flexures, is found in river-water, but feldpni. It 
is (lender, and refembles a ferpentine line. 6. The fpi- 
rilium is exceedingly minute, and twifted in the form of a 
fpiral, which feems to be its natural fhape, .as it never 
untwifts itfelf. It was found, in 1782, in an infufion of 
the fonchus arvenfis. 7. The vermiculus has a milky ap¬ 
pearance, with an obtufe apex, and a languid undulatory 
motion, like that of the common worm. It is found in 
marfhy water in November. It is thought to be the ani¬ 
mal mentioned by Leevvenhoeck as found in the dung of 
the frog and fpawn of the male libellula. 8. The intef- 
tinum is found in marfhy waters, and has a (low progreflive 
motion. 9. The bipunElatus is found in fetid falt-water, 
and moves (lowly, in a ftraight line. 10. The tripundiatus 
is alfo tranfparent and talcy, with both ends tapering. It 
moves in a ftraight line, backwards and forwards 11. 
The paxilifer, or ftraw-like vibrio, called the hair-like ir.- 
feft by Mr. Baker, conlifts of a tranfparent membrane, 
with yellow inteftines, and two or three vifible points. 
The body or middle part, which is nearly ftraight, appears 
in fome compofed of fuch rings as the windpipe of land- 
animals, but in others, feems rather fealed, or made up of 
rings that obliquely crofs one another. Its two ends are 
hooked, or bent, pretty nearly in the fame degree, but in 
a direction oppofite to one another ; and, as no eyes can be 
difeerned, it is difficult to judge which is the head or tail. 
Its progreflive motion is very lingular, being performed 
by turning upon one end as a centre, and deferibing almoft 
a quarter of a circle with the other ; its fhape and form 
may be feen in the plate, at fig. 7. Its motions are very 
flow, and require much patience and attention in the ob- 
ferver. Thefe creatures are found in parcels or cl lifters, 
as deferibed in the circle, at fig. 8. They arrange th'em- 
felves in a variety of forms, but generally aifume a qua¬ 
drangular figure. 12. The lunula, or bow-fhaped vibrio, 
refembles the moon at its firft quarter; it is of a green 
colour, and has from feven to ten globules difpofed in a 
longitudinal direction. 13. The verminus is found in (alt- 
water kept for fome days till it becomes fetid. It moves 
quickly, and with an undulatory motion, backwards and 
forwards. Thefe animalcules feem to be joined together 
in a very Jingular manner. 14. The mallccus is found in 
great plenty in fpring-water, and i.s alternately at reft and 
in motion every moment. 15. The acus is in the (hape of 
a fevving needle ; the neck round and partly tranfparent, 
and marked in the middle with a red point ; the tail re- 
fembling a fine bridle. 16. The fagitta, with a Cetaceous 
tail, and a long and flexible body, is found in falt-water* 
and leems to move by contracting and extending its neck. 
17. The gordins, with a tail terminated by a fmall tuber¬ 
cle, was found in an infufion made with fait wa’er. iS. 
The ferpentulus, fomewhat pointed at both ends. This is 
