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.-E. DESMIDIE.-E. 



Ankistrodesmus falcatus. Cordit. Micrasterias timbriata, Rail's. 

 Aptogonum Bailey i, Rail's. Americana, Rails. 



Arthrodesmus convergens, Ehr. *Sphserozosma serratum, B. 



Closterium acerosum, Schrank. Staurastnim margaritaceum, Ehr. 



setaceum, Ehr. 



Cosmarium ovale, Rail's. INFVSOKIA. 



Desmidium Swartzii, .Ag. Actinophrys viridis, Ehr. 



Didymoeladon furcigerus, Ralfs. Arcella vulgaris, Ehr. 



Didymoprium Borreri, Ralfs. Megalotrocha alboflavicans, Ehr. 



Docidium clavatum, Breb. Ophrydium versatile, Ehr. 



' minutnm, Rail".-.. *Peridinium Carolinianum, B. 



nodulosum, Breb. Rotifer vulgaris, Schr. 



Hyalotheca dissiliens, Breb. Stentor polymorphic, Ehr. 



Micrasterias furcata, Ag. Vorticella chlorostigma, Ehr. 

 Baileyi, Rail's. 



Hydra viridis. 



Tliis 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 : 



DESMIDI'-'.K. DESMIDIEJE. 



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

 Euastrum crassum, Breb. granulatns, Ralfs. 



" insigne, Ha*s. 

 Micrasterias crenata, Breb. DIATOMACE/E. 



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.S. 



Closterium lunula, Ehr Micrasterias denticulata, Breb. 



Desmidium Swartzii, Ag. Peniurn closteroides, Ralfs. 



Didymoprium Borreri, Ralfs. (in immense numbers.) 



Docidium Ehrenbergii, Ralfs. Spirotaenia condensata, Breb. 



minutnm, Ralfs. 



nodulosum, Breb. INFUSORIA. 



Euastrum ansatum, Ehr.. Arcella vulgaris, Ehr. 



affine, Ralfs. " hyalina, Ehr. 



didelta, Ralfs. Difflugia proteieformis. 



Micrasterias crenata, Breb. * " spiralis, B. 



