Microscopical Essays. 

 ix, g o n i u m. 



545 



Vermis inconfpicuus, fimpiiciffimus, complanatus, angulatus. 

 An invifible, fimple, fmooth, angular worm. 



114. Gonium Pectorale. Fig. 17, Plate XXV. 



Gonium quadrangulare, pellucidum moleculis fedecim fphaeri- 

 cis. This gonium is quadrangular, pellucid, with fixteen fpherical 

 molecules. 



Thefe fixteen little oval bodies are nearly equal in fize, of a 

 greenifh colour, pellucid, and fet in a quadrangular membrane, 

 like the jewels in the breaft-plate of the high-prieft, reflecling light 

 on both fides. It's animality is evinced by it's fpontaneous motion, 

 advancing alternately towards the right and left ; thefe little 

 bodies feem oval when in motion, round when at reft ; the four 

 interior ones are a little larger than the reft. Found in pure 

 water. 



115. Gonium Pulvinatum. 



Gonium quadrangulare, opacum, pulvillis quatuor. Qua- 

 drangular, opakc, with four little pillows. 



This appears under the microfcope as a little quadrangular 

 membrane, plain on both fides ; with a deeper lens it looks like 

 a bolfter, formed of three or four cylindric pillows, flattened or 

 funk here and there. Thus it appeared to M. Muller on the firft 



3 W examina- 



