MICROSCOPICAL OBSERVATIONS. \-J 



DITCH BY ROADSIDE, THIRTY MILES EAST OF TAMPA. 



At this locality I collected the following : 



Cosmarium pyranaidatum, Breb. Peniuni digitus, Breb. 



Docidium minutum, Ralfs. Pterodina patina, Ehr. 



Euastrum sublobatum, Breb. Rotifer vulgaris, Schr. 



Micrasterias pinnatifida, Kg. Stentor polymorpha, Ehr. 

 truncata, Breb. 



This spring furnished the following species, viz : 



.Closterium Ehrenbergii, Menegh. Eunotia gibba, Ehr. 

 turgidum, Ehr " librile, Ehr. 



Docidium nodulosum, Breb. Gallionella aurichalcea, Ehr. 



Cocconema cymbiforme, Ehr. Himantidium arcus, Ehr. 



The surface of the spring was covered with a green mucous mass, composed 

 of Nostoc-like filaments, mingled with Mougeotia genuflexa, Ag., and Spirogyra 

 decimina, Kg. 



LITTLE HILLSBOROUGH RIVER, ON THE ROAD FROM PILATKA TO TAMPA. 



This river furnished the following, viz : 



DESMIDIE.E. DIATOMACE^E, <fec. 



Closterium Dianas, Ehr. . Cocconeis pediculus, Ehr. 



Ehrenbergii, Menegh. Cocconema cymbiforme, Ehr. 



*Peridinium carolinianum, B. 

 Pinnularia viridis, Ehr. 

 Synedra vitrea, Kg. 



WITHLACOOCHEE RIVER, ON THE ROAD TO TAMPA. 



March 1st, 1850. In this river I found, among the roots of Pistia stratiotes, 

 the following species, viz : 



DESMIDIE.E. Cocconeis pediculus, Ehr. 



Closterium Dianse, Ehr. Cocconema cymbiforme, Ehr. 



Ehrenbergii, Menegh. Eunotia gibba, Ehr. 



setaceum, Ehr. " librile, Ehr. 



Micrasterias americana, Ralfs. Fragillaria pectinalis, Ehr. 



Himantidium arcus, Ehr. 



DIATOMACE^E, &c. Surirella splendida, Ehr. 



*Amphiprora ornata, B. PI. 2, figs. 15 and 23. Synedra vitrea, Kg 



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