Tilden: list of fresh- water algae. 237 



188. Pleurosigma speiicerii (Quek. ) W. Sm. in Ann. Nat. 



Hist. 12. 1852. 

 Mississippi river. August 23, 1893. Coll. A. P. An- 

 derson. 



189. Gomphonenia coiistrictuni Ehrenb. Abh. 63. 1831. 



Minneapolis. August 3, 1894. 



190. Gomphonenia olivaceuni (Lyngb.) Kg. Bac. 85. 1844. 



Upper Mississippi river. August 17, 1892, Coll. A. 

 P. Anderson. 



191. Cocconeis pediculus Ehrenb. Infus. 194. 1836. 



Fort Snelling. October 1, 1894. 



192. Nitzschia vitrea Norm. var. recta (Hantzsch) V. 



H. Syn. 182. 1880-1885. 

 Osceola, Wisconsin. September 24, 1894. 



193. Odontidium miitabile W. Sm. Br. Diat. 2:17. 1856. 



Minneapolis, November 23, 1894. 



194. Meridion circulare (Grey.) Ag. Consp. 40. 1830-32. 



Second creek. Lake City, Wabasha county. Sept. 4, 

 1894. 



195. Synedra pulchella (Ralfs) Kg. var. miautissima (W. 



Sm.) Grun. in CI. et Grun. Arct. Diat. 107. 1880. 

 Minneapolis. November 15, 1894. 



196. Synedra ulna (NiTzscH) Ehrenb. Inf. 211. 1836. 



Minneapolis. September 24, 1894. 



197. Fragilaria capiicina Desmaz. Crypt, de France ed. i. 



n. 453. 1825. 

 Osceola, Wisconsin. September 24, 1894. - 



198. Raphoneis (?) archeri O'Meara in Micr. Jour. 247. 



1867. 

 Minneapolis. Sept. 13, 1894. Coll. W. D. Frost. 



199. Cystopleura sorex (Kg. ) Kuntze Revis. Gen. Plantar. 



2:891. 1891. 

 Mississippi river. August 29, 1892. Coll. A. P. An- 

 derson. 



200. Arachnoidiscus ehrenbergii Bail. andHARv. Diat. 174. 



1862-74. 

 Minneapolis. September 13, 1194. Coll. W. D. Frost. 



201. Lysigoniuni varians (Ag.) DT. Alg. Abyss. 1891. 



State Fish Hatcheries, St. Paul. October 13, 1894. 



