140 
24. Urococcus, Hassel—U. Hookerianus, Berk. Dripping rocks. 
25. Tetraspora, Link.—T. gelatinosa, Desv. Attached to logs 
and stones in ponds. 
26. Hormospora, Breb.—Z. geminella, n. sp. Filaments simple, 
tubular, aggregated or single; sheath firm, colorless; cells bright green, 
granular, oval, or cylindrical with ends rounded, more or less in pairs, 
rather closely connected, but more widely separated as the plant 
matures.. Diam. of cells .00064”; filaments .00083”. . In pools of 
exposed water. Frequent here, also at Buffalo, N. Y., and in Colora- 
do.—See Rabenhorst’s Algen Europa’s, Dec. 240, No. 2494. 
H. pygmaea, n. sp. Filaments single, gelatinous, even, or, by lon- 
gitudinal division of cells, often undulate. Articles subequal with di- 
ameter, colorless, each contains two green cells, half as long as wide, 
transversely arranged. The general appearance very near Rabenh’s 
figure of H. transversalis, Breb., but very diminutive compared with it. 
Diam. of fil. .0005”. In pools. 
27. Hydrurus, Ag.—H. olivaceus, Naeg. Logs and stones in 
rapid, shaliow waters. 
28. Protococcus, Ag.—Pr. viridis, Ag.—Pr. fuligineus, Lenorm. 
29. Chlorococcum, Fries.—Ch. humilicola, Naeg. Sides of 
shaded wooden vessels of water.—Ch. gigas, Grun.—Ch. infuso- 
rum, Menegh. Both in pools. 
30. Polyedron, Naeg.—P. trigonum, Naeg.—P. tetraedricum, Naeg. 
P. aculeatum, n. sp. Triangular sides concave ; one surface con- 
ically elevated, .and ending, like the three angles, with a rather long 
sharp aculeus. ' 
31. Ophiocytium, Naeg.—O. majus, Naeg.—O.(Svéadium) arbus- 
cula, A. Braun. Marsh pools, etc. - 
32. Coelastrum, Naeg.—C. Naegelii, Rabenh. 
33. Staurogenia, Ktz.—S¢. crucifera, n. sp. Cells rhomboid. 
Sides slightly concave, angles rounded; surface with two lines cross- 
ing each other at right angles at the centre. Usually four cells in a 
family. Diam. of fam. .00084’—-.001”. On boarded sides of basins. 
34. Chlamydococcus, A. Braun.—Chl. pluvialis, A. Braun. 
35- Chlamydomonas, Ehrb,—Chl. obtusa, A. Braun. 
36. Pleurocarpus, A. Braun.—PIl. mirabilis, A. Braun. Pools 
and shallow waters. : 
37. Hydrogastrum, Desv.—H. granulatum, Desv. Exposed soil, 
Buffalo, N. Y. Dr. Wood, also, found imperfect specimens of this 
plant.—H. Wallrothiu, Ktz. Damp earth, Buffalo, N. Y. 
38. Vaucheria, DC.—V. tuberosa, A. Braun, rather a doubtful 
species; shaded clay soil.—V. reptans, Hass. Shaded garden soil.— 
V. velutina, Ag. On earth saturated with warm water. 
39. Microspora, Thuret.—M. laevis, Rabenh. From dripping 
rocks. 
40. Conferva, Link. C. bombycina, Ag. Fresh spring water. 
—C. fontinalis, Berk., attached to wood in sides of reservoir of 
> running water. 
C. Farlowit, n. sp. Filament long, 2-8 or more inches, yellowish 
green in early spring, in maturer state usually of brownish or 
ochreous color, attached to stones or earth in small streamlets of 
