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 amcsnum, Breb. 



pyrarnidatum, Breb. 

 Didymoprium Borreri, Ralt's. 

 Docidium Ehrenbergii, Ralfs. 

 Euastrum elegans, Breb. 

 Micrasterias truncata, Breb. 

 Spirotsenia condensata, Breb. 

 Sphcerozosma excavatum, Ralfs. 



serraturn, B. 



Staurastrum dejectum, Breb. 

 Tetmemorus Brebissonii, Ralfs. 



DESMIDIE.E. 

 Xanthidiura fasciculatum. 



INFUSORIA. 



Arcella angulata, Ehr. 

 Euglena longicauda, Ehr. 

 Megalotrocha alboflavicans, Ehr. 

 Monostyla lunaris, Ehr. 

 *Peridinium carolinianum, B. 



*Aporea ambigua, B. 

 BulbochcBte setigera, Ag. 



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



*Cosmarium depressum, B. 

 *Didymooladon cerberus, B. 

 *Micrasterias arcuata, B. 

 * " expansa, B. 



Micrasterias furcata, Ehr. 



" radiosa, Ehr. 



Penium digitus, Ralfs. 



Xanthidium fasciculatum, Ehr. 



PILATKA. continued. 



Hu*" y 



* - \ 



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 OF 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, Melanin, etc., with valves of an un- 

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

 the earthy matter accompanying them. 



