A N I M A 
of a greenifh colour, “ fet in a quadrangular membrane, 
like the jewels in the breaft-plate of the hi'gh-prieft, re¬ 
flecting light on both fides.” 2. The pulvinatum, is found 
in dung-hills; and appears like a little quandrangular 
membrane, plain on both tides.- 3. The corrugatum, is 
found in various kind? of infufions; and is fomewhat of a 
fquare fliape, very fmall, and in fome pofitions appears as 
ftreaked. 4. The reHangulum., differs but little from the 
former: the angle at the bafe is a right one; the larger 
velicle is tranfparent, the reft green. 5. The tiimcatum, 
is found chiefly in pure water, and then biit feldom : it has 
a languid motion, and is much larger than the foregoing. 
X. Bursaria : a very Ample, hollow, membranaceous, 
worm. 1. The truncatdla , is viiible to the naked eye; 
white, oval, and truncated at top, where there is a large 
aperture defcending towards 'the bafe: rnoft of them have 
four or five yellov. eggs at the bottom. 2. The bullina, 
is pellucid and cryftalline, having fplendid globules of diffe¬ 
rent (izes fwimining about with it: the under fide is convex, 
the tipper hollow, with the fore-part forming a kind of 
lip. 3. The hir undin clla, has two fmall projecting wings, 
which give it fomewhat of the appearance of a bird ; and 
it moves fomething like a fVvallow. 4. The duplella, was 
found among duckweed, and appears like a cryftalline 
membrane folded up, without any viiible inteftines except 
a fmall congeries of points under one of the folds. 5. The 
globina, has a roundilh ftmpe, and is hollow ; the lower 
end being furnifhed with black molecules of different fizes. 
It moves flowly about from right to left. 
XI. Cercaria : an invilible tranfparent worm with a 
tail. 1. The gyrinus, greatly refembles the lpermatic ani¬ 
malcules: it has a white gelatinous body; the fore part 
fomewhat globular; the hind part round, long, and point¬ 
ed : when fwimining, it keeps its tail in continual vibra¬ 
tion like a tadpole. z. The gibba, is found in the infu¬ 
fions of hay and.other vegetables; and is fmall, opaque, 
gelatinous, white, and without any yifible inteftines. 3. 
The inquiries, is found in fait water, and is remarkable for 
changing the ihape of its body : fometimes it appears fphe- 
rical, fometimes like a long cylinder, and fometimes oval. 
4. The lemna, alfo varies its forms fometimes appearing 
of an oblong, fometimes of a triangular, and fometimes of 
a kidney, fliape: the tail is generally ftiort, thick, and an- 
nulated ; but fometimes long, flexible, cylindric, and with¬ 
out rings; vibrating, when ftretched out, with fo much 
velocity, that it appears double: a fmall pellucid globule, 
which Muller fuppofes to be its mouth, is obfervable at 
the apex ; and two black points not eafily difcovered, he 
thinks, are its eyes. 5. The turbo, with a tail like a brill 
tle, is found among duckweed : it is of a talcy appearance, 
partly oval and partly fpherical; and feems to be compo- 
fed of two globular bodies. 6. The pcduria, is found in 
November and December, in marfhy places covered with 
lemna: it is pellucid; and feems to conftft of ahead, 
trunk, and tail; the head refembles that of a herring ; the 
trunk is ventricofe and full of inteftines, of a fpiral form 
and black colour. 7. The viridis, is found in the fpring 
in ditches of ftanding water; and in fome of its dates has 
a confiderable refemblance to the laft, but has a much 
greater power of changing its Ihape. 8. The Jet fera, is 
found in fait water, but feldom: it is fmall, the body ra¬ 
ther opaque, of a round figure, and has a flow rotatory mo¬ 
tion. 9. The hirta, was likewife found in fait water: it 
is opaque and cylindrical ; and, when in motion, the body 
appears to be furrounded with rows of fmall hairs fepara- 
ted from each other. 10. The crimena, has a ventricofe, 
cylindrical, thick, and wrinkled, body; the lower part 
fmall; the upper part terminating in a fmall ftraight neck 
like that of a pitcher. 11. The catellus, has a moveable 
head fixed-to the body by a point: the abdomen is twice 
as long as the head, full of inteftines, and lias a tail ftill' 
narrower, and terminating in two bridles which it can 
unite and feparate at pleafure. 12. The calelina, was found 
in a ditch where there was plenty of duckweed : it is lar¬ 
ger than the preceding, and has a thicker and more cylin- 
Vol. I. No. 46. 
L C U L. E. 72J 
drical body. 13. The lupus , is found in water among 
duckweed, and is larger than moil of the genus: the head 
is larger than the body; the apex turned down into a lit¬ 
tle hook; fometimes it contracts into one half its common 
fize, and again extends itfelf as before. 14. The vermicu- 
laris, is long, cylindrical, flefliy, and capable of changing 
its fliape: it is divided into eight or nine rings or folding- 
plaits ; tire apex either obtufe, or notched into two points; 
and it is found in water where there is duckweed. 15. 
The forctpata, is found in marfhy places, is cylindrical and 
wrinkled, with a forked probofcis which it can thruft out 
or pull in. 16. The pleitronecles, is found in water which 
has been kept for feveral months: it is membranaceous, 
roundifti, and white, with two blackifh points in the fore 
part, the hinder part being furnifhed with a fiender fharp 
tail. 17. The tripos, is flat, pellucid, triangular, having 
each angle of the bafe or fore part bent down into two 
linear arms: it is found in fait water. 18. The cyclidium, 
js frequently found in pure water, and has an oval, -finboth, 
membranaceous, pellucid, body, with a black margin. 
19. The tertax, appears like an oval pellucid membrane, 
fomething larger than the monas l ns ; the fore edge is thick 
and truncated; the hinder part act: e, and terminating in 
a ftiort tail: it whirls about In various directions with great 
velocity. 20. The dijcus, is a fmall orbicular animalcule, 
with a bent tail. 21. The orbis, is round, -and has a tail 
confiding of two long briftles. 22. The luna, is likewife 
round, and has the fore part hollowed into the form of a 
crefcent. 
XII. Leucophra: an invifible, pellucid, and ciliated, 
worm. 1. The conjliclor, with moveable inteftines, is per¬ 
fectly fpherical and femitranfparent, of a yellow colour, 
the edges dark : it rolls from right to left, but feldom re¬ 
moves from the fpot where it is firft found, and is filled 
with a number of the mod minute molecules, which move 
as if they wfere in a violent conflict; and in proportion to 
the number of thefe little combatants which are accumu¬ 
lated either on one fide or other, the whole mats rolls ei¬ 
ther to the right or left; it then remains for a little time 
at reft, and the conflict ceafes; but it foon becomes more 
violent, and the fphere moves the contrary way in a fpiral 
line: when the water begins to fail, they affume an oblong, 
oval, or cylindric, figure; and the molecules ftioot into a 
fhapelefs mafs, which alfo foon vanifhes, and the- whole 
affumes the appearance of cry dais of fal ammoniac. 2. 
The mamilla, is of a dark colour, and filled with globular 
molecules ; ftiort hairs are curved inwards : it is found in 
marfhy water. 3. The vircfcens, is a large, pear-fhaped, 
greenifh-coloured, animalcule, filled with opaque mole¬ 
cules, and covered with fliort hairs; generally moving.in 
a ftraight line: it is found in fait water. 4.. The viridis, 
is much fmaller than the former; fometimes it appears 
contracted in the middle, as if it were to be divided in 
two. 5. The burjata, is found in fait water, and is fimi- 
lar in many refpeCts to the former: it is of a long oval 
fliape, bulging in the middle, and filled with green mole¬ 
cules. 6 . The pojlhuma, is globular, and covered as it 
were with a pellucid net; is found in fetid fait water. 7. 
The aurea, is yellow, oval ; has both ends equally obtufe ; 
little hairs difcovered with difficulty; and has in general 
a vehement rotatory motion. 8. The pertufa, is found in 
fait water; and is gelatinous and fmall, without any mole¬ 
cules. 9. The fraSla, is long, with Initiated angles, white, 
gelatinous, and granulated, changing its form confidera- 
bly. 10. The dilatata, appears like a gelatinous mem¬ 
brane, with a few grey molecules in'the fore-part, and a 
great number in the hinder part. 11. The Jcintillans , was 
found in December, among the fmaller lemnae : it is of a 
green colour, oval, round, and opaque; and is fuppofed 
to be ciliated, from its bright twinkling appearance, which 
probably arifes from the motion it gives the water. 12. 
The veficulifera, is oval, very pellucid, with a defined dark 
'edge and infide, containing fome Very bright bladders or 
veficles; the middle frequently appears blue, and the ve- 
liqjes appears if fet in a ground of that colour. 13. The 
X global fra, 
