PLANTS OF RHODE ISLAND. 119 
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AMPHORA, Ehrb. 
leevissima, Grev. Rocky Point, S. A. Briggs. 
robusta, Greg. Rocky Point, 8S. A. Briggs. 
affinis, Kutz. Rocky Point and Newport, S. A. Briggs. 
ovata, Kutz. Providence, &c. 
SPHENELLA, Ag. 
rostellata, Kutz. Providence, S. T. Olney. No. 183. 
GOMPHONEMA, Ag. 
coronatum, Ehrb. Providence, &c. 
constrictum, Ehrb. Providence, Olney. No. 184. 
capitatum, Ag. Providence. 
marinum, W. S. Newport, S. A. Briggs ; Providence. 
dichotomum, Kutz. Providence. 
truncatum, Ehrb. Providence. No. 185. 
minutum, Ag. Providence. No. 186. 
gemmatum, Ag. Providence. 
NAVICULA, (Bory,) Rab. 
Americana, Ehrb. Rocky Point, S.A. Briggs ; Providence. 
didyma, Ehrb. Mark Rock, S. A. Briggs. 
Silicula, Ehrb. Quidnessett. 
mesolepta, Ehrb. Rocky Point, S. A. Briggs. 
major, Rab. Rocky Point, S. A. Briggs ; Providence, &c. 
gibba, Ehrb. Rocky Point, S. A. Briggs. 
var. gracilis. Rocky Point, S. A. Briggs. 
amphisbena, Bory. Providence. 
Lyra, Ehrb. Newport, S. A. Briggs. 
Tabellaria, Ehrb. Providence, Rocky Point, Briggs. 
exilis, Kutz. Providence. 
affinis, Ehrb. Quidnessett. 
radiosa, Kutz. Providence, Rocky Point, 8. A. Briggs. 
gracilis, Ehrb. Providence, Olney. No. 187. 
peregrina, Ehrb. Rocky Point, S. A. Briggs. 
Viridis, Nitzsch. Providence, Olney. No. 188. 
STAURONEIS, (Ehrb.) Kutz. 
phyllodes, Ehrb. Providence. 
phoenicenteron, Nitzsch. Providence, Olney ; Rocky Point, 
S. A. Briggs. No. 189. 
Baileyi, Ehrb. Quidnessett. 
gracilis, Ehrb. Rocky Point, S. A. Briggs. 
aspera, —-. Rocky Point, S. A. Briggs ; Providence. 
