MICROSCOPICAL OBSERVATIONS. 7 



Near the same locality I found Botrydium argillaceum, Wall 1 and Vaucheria 

 racemosa, Lyngb. 



POND BY THE SIDE OF THE RAIL-ROAD, NEAR SAVANNAH. 



Dec. 21th, 1850. — The bottom of this pond was covered with beautiful, waving, 

 plume-like masses of Myriophyllum, among the leaves of which the following 

 species were found : — 



Alg^. 

 Bulboclisete setigera, Ag. 

 Tolypothrix distorta. Kg. 



Desmidie^e. 

 Ankistrodesmus faloatus, Corda. 

 Aptogonum Baileyi, Ralfs. 

 Closterium setaceum, Ehr. 

 Cosmarium Broomeii, Thwaites. 

 " cucumis, Corda. 



" pyramidatum, Breb. 



Desmidium Swartzii, Ag. 

 Didymoprium Grevillii, Ralfs. 

 Docidium baculum, Breb. 

 " verrucosum, B. 

 " constrictum, B. 

 Euastrum crassum, Breb. 



Desmidie^. 

 Euastrum didelta, Ralfs. 

 " elegans, Breb. 



" muricatum, B. 

 " rostratum, Ralfs. 

 Micrasterias Americana, Ralfs. 



" rotata, Ralfs. 



Penium digitus, Breb. 

 *Triplooeras verticillatum, B. 



* " gracile, B. 

 Sphaerozosma excavatum, Ralfs. 



* " serratum, B. 

 Xanthidium cristatum, Ehr. 



Infusoria. 

 Arcella vulgaris, Ehr. 

 Peridinium cinctum, Ehr. 



DITCHES NEAR THE CANAL OF SAVANNAH. 



On the road to the steam saw-mill, above Savannah and near the canal, the 

 following species were seen in ditches, viz : 



Alg^. 

 Chsetophora pisiformis, Ag. 

 Nostoc, sp. undetermined. 

 Spirillum, sp. do. moving actively, 

 Spirogyra decimina. Kg. 



Desmidie^. 

 Closterium acerosum, Schrank. 



DlATOMACE^. 



Baoillaria paradoxa, Ehr., abundant and active. 

 Gallionella aui'ichalcea, Ehr. 



DiATOMACEiE. 



Naunema, sp. undetermined, with long slender 

 frustules. 

 " " " with lanceolate 



frustules. 



Navicula amphirhynchus, Ehr. 



Synedra vitrea, Kg. 



Infusoria. 

 Arcella vidgaris, Ehr. 

 Euglena viridis, Ehr. 

 Rotifer vulgaris, Schrank. 

 Synura uvella, Ehr. 



