Micros c.o pic a l Essays. 



479 



lower part is fwelled out as it is reprefented in Fig. 4 ; the 

 point is afterwards projected from this ventricofe part. It pafles 

 through five different forms before it arrives at that which is feen 

 at Fig. 4. It fcarcely moves from one fpot, only bending about 

 fideways. It is to be found in river water, where the C nitida 

 grows, — -a the tail, c the head,, d the protuberant fwelling. 



III. V O L V O X. 



Volvox inconfpicuus fimpliciffimus, pellucidus, fpheericus. 

 An invifible, very fimple, pellucid, fphserical worm. 



13. Volvox Punclum, 



Volvox fphaericus, nigricans, puncxo lucido. Spherical, of a 

 black colour, with a lucid point. 



A fmall globule ; one hemifphere is opake and black, the 

 other has a pellucid crystalline appearance ; a vehement motion 

 is obfervable in the dark part. It moves in a tremulous manner, 

 and often pades through the drop, turning round as if upon an 

 axis. Many may be often feen joined together in their paffage 

 through the water, they fome times move as in a little whirlpool, 

 and then feparate. It is found in great numbers on the furface of 

 fcetid fea water. 



14. Vol- 



