119 
ed. With Batrachospermum in a ditch, above dam at Chemo 
stream. August 20, 1890. 
Family VIII.—Confervacez. 
152. Chetophora pisiformis, (Roth.) Ag., p. 116, Pl. CH1— 
Associated with above and attached to Batrachospermum. 
Diameter of filaments in our own specimens 5-9 mw. Articula- 
tions I-3 times as long as wide. Branchlets from 4-5 times as 
long as wide. Terminal cells more blunt than described by 
Wolle. 
Family X.—Vaucheriacee. f 
153. Vaucheria geminata. (Vauch.) D.C. p. 151, Pl. 
CXXVIII.— Associated with the above. August, 20, 1890. 
Family XII.—Volvocacee. 
154. Exdorina stagnale, Wolle, p. 160, Pl. CLII.—Ccenobium 
150 4, containing only sixteen cells each 20 py. Our specimen 
contained no green in the cytoplasm between the cells. Associ- 
ated with diatoms, desmids and filamentous alge in Pushaw 
stream. 
155. Gontum pectorale, Mueller, p. 163, Pl. CLL—Meadow 
spring on college farm, Orono, Me. Not abundant. October, 1891. 
Family XIII.—Protococcacee. 
156. Scenedesmus dimorphus, Kg., p. 173; PI.CLVI.—Pushaw 
stream, October, 1890. 
157. Protococcus viridis, var. Wimmeri, Wolle, p. 183, Pl. 
CLXI, F igs. 14-20.—Our specimens were dark green and 
measured 51 44 d. Pushaw stream among alga. October, 1891. 
Family XIV.—Palmellacee. 
158. TETRASPORA MACROSPORA, N. sp. ; 
Thallus membranaceous, with firm, gelatinous, transparent in- 
terior, small (about 134 inches long), irregularly expanded and 
divided, verrucose, free, light green. Cells spherical or oblong, 
stanular, geminate, quaternate or finally scattered, 5-16 yd, 
10-13 4 a common size. 
Floating free in a spring on the college farm, Orono, Me. 
October, 1891, F. L. Harvey. 
