8 MICROSCOPICAL OBSERVATIONS. 



VICINITY OF GRAHAMVILLE, BEAUFORT DISTRICT, S. C. 



January, 1850. — In the ditches and " Backwater" of Dr. Bolen's rice field, 

 near Grahamville, S. C, I detected the following species on the 1st of Janua- 

 ry, 1850. 



Desmidik^. Desmidie.*:. 



Ankistrodesmus falcatus, Corda. Micrasterias fimbriata, Ralfs. 

 Aptogoiram Baileyi, Ralfs. " Americana, Ralfs. 



Arthrodesmus convergens, Ehr. *Sph8erozosma senatum, B. 



Closterium acerosum, Schrank. Staurastrum margaritaceum, Ehr. 



" setaceuin, Ehr. — 



Cosmarium ovale, Ralfs. Infusoria. 



Desmidium Swartzii, Ag. Actinophrys viridis, Ehr. 



Didymocladon furoigenis, Ralfs. Arcella vulgaris, Ehr. 



Didymoprium Borreri, Ralfs. Megalotrocha alboflavicans, Ehr. 



Dooidium clavatum, Breb. Ophrydium versatile, Ehr. 



" miiiutum, Ralfs. *Peridinium Caroliniamim, B. 



" nodulosum, Breb. Rotifer vulgaris, Schr. 



Hyalotheca dissiliens, Breb. Stentor polymorphus, Ehr. 



Micrasterias furcata, Ag. Vorticella chlorostigma, Ehr. 

 " Baileyi, Ralfs. — 



Hydra viridis. 



This locality is chiefly remarkable for the great abundance of the curious and 

 novel form Peridinium Carolinianum. See p. 41. 



GRAHAMVILLE, s c. — Continued, 

 In a small ditch by the side of the road leading from Grahamville to Savannah, 

 and about a mile from Grahamville, the following forms were seen, viz : 



Desmidif^. Desmidie.«. 



Cosmarium margaritiferum, Menegh., abimdant. Tetmemorus Brebissonii, Ralfs., abundant. 

 Euastnim crassum, Breb. " granulatus, Ralfs. 



" insigne, Hass. — 



Micrasterias crenata, Breb. Diatomace^. 



" denticulata, Breb., abundant. Eunotia tetraodon, Ehr. 



GRAHAMVILLE, s. c. — Continued. 

 In pools near the dam of a " Backwater," on the road to Savannah, about two 



and a half miles from Grahamville, great numbers of the following species were 

 found, viz : 



Desmidie.'E. Desmidie^. 



Closterium lunula, Ehr. Micrasterias denticulata^ Breb. 



Desmidium Swartzii, Ag. Penium closteroides, Ralfs. 



Didymoprium Borreri, Ralfs, (in immense numbers.) 



Docidium Ehrenbergii, Ralfs. Spirotsenia condensata, Br^b. 



" minutum, Ralfs. — 



" nodulosum, Breb. Infusoria. 



Euastnim ansatum, Ehr. Arcella vulgaris, Ehr. 



" affine, Ralfs. " hyalina, Ehr. 



•' didelta, Ralfs. Difflugia proteaeformis. 



Micrasterias crenata, Breb. * " spiralis, B. 



