MICROSCOPICAL OBSERVATIONS. 



15 



PONDS NEAR PILATKA. 



In the " First Pond," about five miles west of Pilatka, the following species 

 were collected, viz : 



Desmidie.e. 

 Ankistrodesmus falcatus, Corda. 

 Cosmarium amcenum, Breb. 



" pyramidatum, Breb. 



Didymoprium Borreri, Ralfs. 

 Docidium Ehrenbergii, Ralfs. 

 Euastnim elegans, Breb. 

 Micrasterias touncata, Breb. 

 Spirotsenia condensata, Breb. 

 Sphserozosma excavatum, Ralfs. 

 * " serratum, B. 



Staurastrum dejectum, Breb. 

 Tetmemorus Brebissonii, Ralfs. 



Desmidie^. 

 Xanthidium fasciculatum. 



Infusoria. 

 Arcella angulata, Elir. 

 Euglenalongicauda, Ehr. 

 Megalotrocba alboflavicans, Ehr. 

 Monostyla lunaris, Ehr. 

 *Peridmium carolinianum, B. 



AlctjE. 

 *Aporea ambigua, B. 

 Bulbochsete setigera, Ag. 



In the " Second Pond," near the above locality, were found — 



*Cosmarium depressum, B. 

 ■*Didymocladon cerberus, B. 

 *Micrasterias arcuata, B. 

 * " expansa, B. 



Micrasterias furcata, Ehr. 

 " radiosa, Ehr. 



Peniiim digitus, Ralfs. 

 Xanthidium fasciculatum, Ehr. 



PILATKA. — continued. 



In a deep ravine south of Pilatka, I found large brown masses of Diatoma 

 Ehrenbergii, Kg., attached to twigs, etc., in a small stream. 



SHELL BANKS OP PILATKA. 



While at Pilatka, I carefully examined the immense deposit of fluviatile shells 

 upon which the town is built, and which is chiefly made up of Paludina vivipara, 

 Ampullaria depressa, several small Helices, Melanise, etc., with valves of an un- 

 determined Unio. I could detect no trace of microscopical organisms in any of 

 the earthy matter accompanying them. 



