710 WORMS. INFUSORIA. 107. Cercaria. 
Mytilus. Oblong, broader at each extremity, tranfparent, 
and horned. 
Adams Micra/c. p. 532. tab. 27. fig. 29. 
Ill marfii water; pellucid, white and rounded at both ends, dar* 
in the middle vvitii black intcilines mixed with a lew whit* 
molecules, the fore-part ciliate and armed with 2 horns, th* 
hind-part ciliate and lurnifhed with z briftles reaching beyond 
the margin. 
Lepiu. Ovate, hairy on tlic fore-part and briftly behind. 
Adams Micrcfc. p. 532. n. 270. 
In vegetable and animai infufions ; comprelTed, with 2 or 3 
moveable lucid dots on the fore-part. 
Silurus. Oblong, hairy at both ends and ciliate on the back. 
Ada/as Micrcfc. /. 533. «• 271. 
In ftagnant water : iinooth, opake, crooked, with a very lharp ta'* 
furnilhed with unequal rows of moveable hairs. 
fal^tium. Broadilh, oblong, with glittering horns on the fore-part. 
Adams Micrcfc. p. 533. n. 272. 
In vegetable infulions; broad, flat, obtpfe at both end?, with* 
black foot and a few briftles near the hinder extremity ; on the 
fore-part 2 moveable horns and 5-5 black moveable points. 
107. CEPvCARIA. Worm invifiblc to th^ 
naked eye, pellucid ^nd furnilhed -with 
a tail. 
^Gyrinus. Round, with a lliarp-pointed tail. 
Baker Micrcfc. expl. tab,. \o. Jig. i ? 
Bill an. tab. 1 , 3. Len-.'euh r/. 41 5. 
Frank. Samml. 4. p, 227. n. \ .f, a, p. y/Z. t, 3./, a, b. 
Ledermulleran.fpcrm.fig. I, 2? 
In animal infufions : white, gelatinous, fore-part nearly globol**'' 
^Injuieta. Changeable, convex, with a fmooth tail. 
Adams Micrcfc. p. 493. tab. z^ f. 30, 31. 
In fait water; white, gclatinou?, changing its lhape intc a fph!*' 
rical long or oval figure, but always prelerving its tail. 
9lemna, Changeable, fomewhat flattened, with an annulate tail. 
Adams Micrcfc. p. 494. tab. 25. f. 33 — 35. 
In ditch water ; body changing to oblong, triangular or kidn*/' 
fliaped; tail Ihort, thick, annulate, or long, flexile vvithout ring*' 
