32 



A filamentous alga — cells about length of four diameters, with 

 two stellate bodies in each cell. 



Volvox globator, with yellow resting-spores, but some, although 

 revolving, were without spores and full of a filamentous sub- 

 stance. 



DESMIDIACEjE. 

 Closterium Ehrenbergii. 



„ lunula. 



Euastrum oblongum. 

 Pediastrum Boryanum. 



„ Ehrenbergii. 



„ granulatum. 



Scenedesmus acutus. 



,, quadricauda. 



Straurastrwn giacile. 

 DIATOMACEJS. 



Cocconema lanceolatum. 



Pleurosigma angulation. 



Surirella. 



A stipitate diatom. 



M icr aster ias. 

 CHARACEsE. 



Nitella fiexilis — in fruit. 

 INFUSORIA. 



Actinophrys sol. 



An thophysa M i'dleri. 



Arcella vulgaris. 



Bursaria truncatella. 



Chcetonotus larus. 



Chaetotyphla armata. 



Coleps hirtus. 



Euglena viridis, and the red form of ditto. 



Epistylis. 



Stentor niger. 

 ,, viridis. 



Vaginicola crystallina. 

 Vorticella, many varieties. 



Stylonichia. 



