PLANTS OF RHODE ISLAND. 119 



AMPHORA. Ehrb. 



1. laevissima, Grev. Rocky Point, S. A. Briggs. 



2. robusta, Greg. Rocky Point, 8. A. Briggs. 



3. aflBlnis, Kutz. Rocky Point and Newport, S. A. Briggs. 



4. ovata, Kutz. Providence, &c. 



SPHENELLA, Ag. 

 rostellata, Kutz. Providence, S. T. Olney. No. 183. 



GOMPHONEMA, Ag. 



1. coronatum, Ehrb. Providence, &c. 



2. constrictum, Ehrb. Providence, Olney. No. 184. 



3. capitatum, Ag. Providence. 



4. marinum, W. S. Newport, S. A. Briggs ; Providence. 



5. dichotomum, Kutz. Providence. 



6. truncatum, Ehrb. Providence. No. 185. 



7. minutum, Ag. Providence. No. 186. 



8. gemmatum, Ag. Providence. 



NAVICULA, (Bory,)Rab. 



1. Americana, Ehrb. Rocky Point, S. A. Briggs ; Providence. 



2. didyma, Ehrb. Mark Rock, S. A. Briggs. 



3. Silicula, Ehrb. Quidnessett. 



4. mesolepta, Ehrb. Rocky Point, iS. A. Briggs. 



5. major, Rab. Rocky Point, S. A. Briggs ; Providence, &c. 



6. gibba, Ehrb. Rocky Point, S. A. Briggs. 



var. gracilis. Rocky Point, S. A. Briggs. 



7. amphisbaena, Bory. Providence. 



8. Lyra, Ehrb. Newport, S. A. Briggs. 



9. Tabellaria, Ehrb. Providence, Rocky Point, Briggs. 



10. exilis, Kutz. Providence. 



11. aflSnis, Ehrb. Quidnessett. 



12. radiosa, Kutz. Providence, Rocky Point, S. A. Briggs. 



13. gracilis, Elirb. Providence, Olney. No. 187. 



14. peregrina, Ehrb. Rocky Point, S. A. Briggs. 



15. viridis, Nitzscli. Providence, Olney. No. 188. 



STAURONEIS, (Ehrb.) Kutz. 



1. phyllodes, Ehrb. Providence. 



2. phoenicenteron, Nitzsch. Providence, Olney ; Rocky Point, 



<S. .1. Briggs. No. 189. 



3. Baileyi, Ehrb. Quidnessett. 



4. gracilis, Ehrb. Rocky Point, .S. A. Briggs. 



5. aspera, — . Rocky Point, S. A. Briggs ; Providence. 



