I e R O S C O P I C A L Es S A Y s 



55* 



ffiort, thick, and annul ated, fometimes long, bending, cylindric, 

 and without rings. It vibrates, when it is 11 retched out, with fo 

 much velocity, that it appears as it were double. The inteftines- 

 not very diftinft, near the apex a fixiall pellucid globule is per- 

 ceivable, that Muller takes to be its mouth; two black points 

 which are near it, but with difficulty difcovered, he fuppofes to 

 be the eyes. It draws the tail fometimes into the body. Fig. 33, 

 a, the body rather fpherical, b the tail ; Fig. 34, c, the triangu- 

 lar body ; Fig. 35, the body extended, e e the eyes, f f the bow- 

 els, g a large veficle,, b a fmaller one. 



It walks (lowly after taking three or four fleps ; it extends the 

 tail, erecling it perpendicularly, making and bending it ; in this ; 

 ftate it refembles much the leaf of the lemna. 



128. Cercaria Turbo. Fig. 30, tlate XXV. 



(Sercaria globulofa, medio coarclata, cauda unifeta. Globular: 

 cercaria, the middle contracted, with a tail like a bridle. 



Partly of an oval, and partly of a fpherical fhape, pellucid, 

 and of a taley appearance. It feems to be compofed of two glo- 

 bular bodies, the lower one being the fmalleft ; this figure is oc- 

 caiioned by the contraction at the middle. There are two black-, 

 points, like eyes, at the upper part of the animalculum, even with 

 a tranfverfe line which erodes the top of this little creature ; feve- 

 ral large globules may be difcerned, the tail is fometimes quite 

 [trait, fometimes turned back on. the body. It is to be met. with 

 among, the duck-weed. . 



12-9. Cerf 



