244 WEST: ADDITIONS TO FRESHWATER ALG#., 
*Cladophora flavescens Ag. Rawcliffe Common. 
sae aaa: Siteinleai Kiitz. Still waters of a spring, 
Moughton 
on ae Ag. *Var. pulchella Kiitz. Peny- 
nt. 
eucceatis pisiformis (Roth.) Ag. Rawcliffe; Askern. 
OrpER—CHROOLEPIDE 
Trentepohlia aurea (Linn.) Mart. [Chroolepus aureus (Linn.) 
Kiitz.] Moughton Fell. 
Microthamnion vexator Cooke. Greetland near Halifax. 
CLtass—CONJUGATEX. 
ORDER—M ESOCARPEZE 
Many examples have been observed from various localities, but 
could not be determined as they were not in conjugation. 
OrRDER—ZYGNEMACE. 
*Zygnema insigne (Hass.) Kiitz. Long. cell. veget. 37—95 #3 
lat. cell. veget. 23-525; diam. zygosp. 28—-33p. Abun- 
dantly in fruit from Malham. 
Sirogonium sticticum (Eng. Bot.) Kiitz. Ingleton. 
ORDER—DESMIDIACE. 
Gonatozygon brebissonii DeBary. Malham Tarn. 
*Gonatozygon kinahani Arch. Lat. 1r—12; 14—20 longius 
quam latum. Malham Tarn; Penyghent. 
Sphzrozosma vertebratum Ralfs. *Forma minor. Long. 
g—top; lat. 13°5—14p; lat. isthm. 7°54. Malham Tarn. 
Sphzrozosma excavatum Ralfs. Penyghent; Ribblehead. 
Hyalotheca dissiliens (Sm.) Bréb. Greetland near Halifax. 
Pleurotenium truncatum (Bréb.) Nag. Rawcliffe Common- 
Closterium obtusum Bréb. Greetland, near Halifax. 
Closterium acerosum (Schrank) Ehrnb. Rawcliffe Common. 
Closterium lanceolatum Kiitz. Moughton Fell; Penyghent. 
*Closterium przlongum Bréb. Forma brevior Nord. 
(‘Freshw. Alg. of New Zeal. and Austr.,’ p- 68, pl. 3 
fig. 22-24). Rawcliffe Common. 
Closterium ehrenbergii Meneg. Moughton Fell; Askern- 
Closterium moniliferum Ehrnb. Moughton Fell; Askern; 
Ribblehead; Malham Tarn. 
—— 
Naturalist, 
