116 PLANTS OF RHODE ISLAND. 



CHROOCOCCUS, Naegr. 

 turgidus, Naegr. Common. 



Diatomacece.* 

 EPITHEMIA, Kutz. 



1. gibba, Kutz. Providence. 



2. constricta, W. S. Rocky Point, S. A. Briggs. 



3. Westermanni, Kutz. Newport, S. A. Briggs. 



4. turgida, Kutz. Providence, &c. 



5. granulata, Ebrb. Providence, &c. 



6. Sorex, Kutz. Rocky Point, S. A. Briggs. 



EUNOTEA. Ehrb. 



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



No. 168. 



2. Diadema, Ehrb. "Providence." No. 169. 



HIMANTIDIUM, Ehrb. 



1. pectinale, Kutz. Providence, 0/jie?/ ,• Rocky Point, Bn'r/j/s; 



No. 170. 



2. arcus, Ehrb. Providence, Olney. No. 171. 



MERIDION. (Leibl.) 



1. constrictum, Ralfs. Providence, Olney ; Rocky Point, 



Briggs. No. 172. 



2. circulare, Ag. Common. 



LICMOPHORA, Ag. 



1. flabellata, Grev. Providence. 



2. Pappeana, Grev. Newport, S. A. Briggs. 



FRAGILARIA, (Lyngb.) 



1. capucina, Kutz. Common. No. 174. 



2. virescens, Ralfs. ' Common. No. 176. 



3. pectinalis, Ehrb. Common. No. 175. 



ASTERIONELLA, Hass. 



1. formosa, Hass. Very common in Pawtuxet water. 



2. Ralfsii, Sm. ? Meshanticut river. 



NITZSCHIA, (Hass.) Smith. 

 Amphioxys, Ehrb. Providence. 



CERATONEIS, Ehrb. 



1. longissima, Breb. Rocky Point, S. A. Briggs. 



2. linearis, Ehrb. Rocky Point, S. A. Briggs. 



* Diatoms follow naturally Desmids, but are removed in this list for conve- 

 nience of reference to Mr. Wolle's manuals on Desmids and F. W". Algoe. 



