12 MICROSCOPICAL OBSERVATIONS. 



DlATOMACE.E. INFUSORIA. 



Pinnularia amphigompha, Ehr. Dinobryon sertularia, Ehr. 



Diatoma stellaris, B. Euglena longicauda, Ehr. 



Peridinium cinctum, Ehr. 



Rotifer vulgaris, Schr. 



Stentor polymorpha, Ehr. 



GLYNN COUNTY, GA. 

 HOPETON, ON THE ALTAMAHA, RESIDENCE OF J. HAMILTON COUPER, ESQ. 



About the time when I arrived at Mr. Couper's hospitable mansion, there had 

 been several severe frosts, and some days of cold rains. Under these circum- 

 stances, the opportunities to collect the microscopic forms were much less favor- 

 able than at the preceding localities. The rice-field muds at this locality proved 

 to be quite rich in remains of diatomaceous shells, agreeing with those noticed 

 on the Savannah and Ogeechee, and furnishing abundance of the following 

 forms, viz : 



Antinocyclus, several species. Pinnularia interrupta, Kg. 

 Actinoptychus denarius, Ehr. " viridis, Ehr. 



senarius, Ehr. Rhaphoneis rhombus, Ehr. 



* Campy lodiscus argus, B. Terpsinoii musica, Ehr. 

 Eupodiscus Rogersii, Ehr. Triceratium favus, Ehr. 



* " radiatus, B. reticulum, Ehr. 

 Gallionella sulcata, Ehr. Zygoceros rhombus, Ehr. 

 Pinnularia amphyoxys, Ehr. 



In a rice-field ditch, remote from the river, I found the following species in a 

 living state, viz : 



DESMIDIE.E. DIATOMACE.E. 



Closterium laneeolatum, Kg. Surirella splendida, Ehr. 



Desmidium Swartzii, Ag. Synedra vitrea, Kg. 

 Micrasterias crenata, Breb. 

 Scenedesmus obliquus, Kg. INFUSORIA. 



Goiiium peetorale, Ehr. 



DIATOMACE.E. Hydatina senta, Ehr. 



Cocconema cymbiforme, Ehr. Lai-inularia socialis, Ehr. 



Eunotia gibba, Ehr. Synura uvella, Ehr. 



" librile, Ehr. Vaginicola crystallina, Ehr. 



" amphyoxys, Ehr. 



Fragillaria pectinalis, Ehr., in large masses ALG.E, &c. 



Gallionella aurichalcea, Ehr. *Aporea ambigua, B. 



Gomphonema constrictum, Ehr. Coleochaete scutata, Breb. 



Navicula hippocampus, Ehr. Mougeotia genuflexa, Ag. 

 Naunema. undet., frustules slender. 



