Microscopical Essays. 



611 



This is a lingular animalculum, even among thofe where all 

 are lingular ; viewed fideways it is fometimes cylindrical, though 

 fomewhat tapering towards the hinder-part, with a broad pellu- 

 cid edge ; viewed from the top it has fometimes a broad face, or 

 difc, furniflied with radiating hairs, the under part contracted in- 

 to a globular fhape, of a dark-green colour, and filled with fmall 

 grains. It was found in October with the lefier lemna. 



2cp. Vorticella Polymorpha. Fig. 33, 34, 35, Plate XXVI. 



Vorticella multiformis, viridis, opaca. Many-fhaped vorti- 

 cella, green, opake. 



To the naked eye it appears as a mod agile green point ; when 

 viewed by the microfcope, it puts on every moment fo many and 

 fuch various forms, that they can neither be exhibited to the eye 

 by drawings, nor defcribed by words ; it is truly one of the won- 

 ders of nature, aftonifhing the mind, fatiguing the eye, and con- 

 tinually exciting the fpeclator to alk, 



" Quo teneam vultus mutantem protea nodo?" 



Fig. 33, 34, 35, reprefent it in three different forms ; a the 

 fore-part, g the hind-part, c the fore-part fimple, d the fore-part 

 turned in or doubled, the body is granulous, a feries of pellucid 

 points is "fometimes to be obferved. 



4 E 2 2 9 1 > Vor- 



