121 
ered with two feet of water. We have made drawings of four 
fruiting filaments.. It will be noticed that the length of the neck 
between the filaments is quite variable. 
In fig. 12 aand 4 the zygospores are spherical; in fig. 12 ¢ 
barrel-shaped ; in fig. 12 d@ the conjugation seems to have taken 
place between the end of one filament and the side of another. 
The conjugation does not always occur the same distance from 
the ends of the filaments. Our specimens were not so large as 
those shown by Wolle, the filaments being only 35 wd. The 
zygospores were dark green and about 60 wd. Some of the 
cells were fully twelve times as long as wide and others only 
four times as long. The plant mass was submerged and attached 
to sticks. Collected October 3, 1891. F. L. Harvey. 
Family XVII.—Desmidiee. 
162. Desmidium Baileyi (Ralfs.) Wolle, p. 27, Pl. I. Our 
specimens not twisted. The excavations between the angles longer 
and narrower than in Wolle’s figures, and the edges of the cells 
slightly concave. This may prove to be a new species. Pushaw 
stream, among algae. October, 1890. 
163. Spherozosma vertebratum (Breb.) Ralfs., p. 30, Pl. IV.— 
Our specimens were from 15-20 ju wide and enveloped in a 
mucous sheath fully 60 4 wide. The cytoplasm was sometimes 
cruxiform in the cells. The filaments were apparently without 
twist. Attached to logs in the Penobscot River. October, 1890. 
164. Closterium subtile, Breb., p. 158 (Appendix), Pl. VII. 
—Our specimens were sometimes 5 «4d. Swamp back of col- 
lege woods, Orono, Me. | 
165. C. attenuatum, Ehrb., p. 41, Pl. VILI.—The ends in our 
specimens more attenuated than Wolle’s figure. Frog pond, 
Orono, Me. 
166. C. montliferum, Ehrb., p. 45, Pl. VII.—Chloroplyllous 
sranules large, fully one-third the diameter of the cell where they 
°ccur, and five in each half cell. Our specimens were about 47 
* 306 4. Spring, college meadow, Orono, Me. Oct., 1891. 
167. C. rostratum, Ehtb., p. 46, Pl. VIII.—25 x 385 ¥. Pu- 
shaw pond. Much longer than type. Probably new. Oct., 1890. 
