244 
P. Ehrenberghu (Corda) A. Br. November, March. 
P. pertusum, Kitz. December. 
Raphidium polymorphum, Fres. Frequent throughout the six 
months. 
var. sigmoidea, Rab. January Ist and 18, 1893. 
var. aciculare, A. Br. January 1, 1893. 
Polyedrium longispinum (Pertz.) Rab. Occasional. 
Characium Negelit, A. Br. Observed once only, diagnosis un- 
certain. 
Pleurococcus vulgaris, Menegh. Infrequent. 
Dictyospherium Ehrenberghu, Nag. Occasional. 
Spirogyra tenuissima (Hass.) Kiitz. During the latter part of 
January and during February the water was very low in the 
reservoirs and this species appeared in great quantities. 
S. varians (Hass.) Kiitz. With the former but in much smaller 
quantities. 
Coleochete soluta, Prings. December 17th—24th. What seemed 
to be a broken fragment of this plant. 
DESMIDE. 
fTyalotheca dissiliens (Smith) Breb. Common from January 29, on. 
Desmidium aptogonium, Breb. With Hyalotheca dissiliens. 
D. Baileyi(Ralfs) Wolle. Only once observed. April 15. 
Spherozosma filiforme, Rab. Occasional. 
S. excavatum, Ralfs. Occasional. 
S. spinulosum, Deep.? A plant that resembled this was observed 
Dec.2: 
Closterium gracile, Breb. Infrequent. 
C. striolatum, Ehrb. Occasional. 
C. Diane, Ehrb. Frequent. 
C. rostratum, Ehrb. Common. 
Docidium Trabecula (Ehrb.) Nag. Common lately. 
Cosmarium moniliforme, Ralfs. Infrequent. 
C. Becku, Wille. Scarce. 
Xanthidium cristatum (Breb.) Ralfs. November 27, 1892. 
X. antelopeum (Breb.) Kiitz. Occasional. 
Arthrodesmus Incus (Ehrb.) Hass. Occasional. 
A. octocornis, Ehrb. Infrequent. 
