Algse of the English Lake District. By Wm. West. 743 
Genus Gloeothece Nag. 
*G. linearis Nag. (Gatt. eing. Alg., p. 58, t. i. G, f. 2). Hk , L. 
*G. violacea Rabh. (FI. Eur. Alg., ii. p. 61). 
Diam. cell. s. teg. 0*6-0 *9 /. i , c. teg. 6-9 ya. Sk. 
The teguments were highly refractive. 
G. cystifera (Hass.) Rabh. var. maxima var. n. 
Cellula latitudine lj-plo longior, duplo major quam in 
forma typica, cytioplasmate granuloso. 
Long. cell. s. teg. 14-16 ya, c. teg. 18-30 ya ; lat. cell. s. 
teg. 9-10 ya, c. teg. 13-20 ya. Bn. 
Genus Aphanothece Nag. 
A. microscopica Nag. Bn., R., Scarf Gap Pass. 
A . saxicola Nag. Bn., Bt., Esthwaite Water, foot of Bow Fell, 
near Angle Tarn. 
Genus Glaucocystis Itz. 
G. Nostochinearum Itz. Bo. 
Genus Tetrapedia Reinsch. 
T. Beinschiana Arch. Bn., Esthwaite Water. 
Class Diatomace^e. 
Genus Cyclotella Kiitz. 
C. operculata (Ag.) Kiitz. B. 
G. Kutzingiana Thw. B., H. (at 2400 ft.). 
Genus Melosira Ag. 
M. varians Ag. Bo., Bn., Yale of Newlands, Crummock Water. 
M. nivalis Sm. Bo., near Windermere. 
Genus Surirella Turpin. 
S. linearis Sm. Common. Occurs up to 2400 ft. on Helvellyn. 
var. constricta (Grun.) Rabh. Hp., Bn., C., Kirk Fell. 
8. biseriata (Ehrnb.) Breb. Frequent. Occurs up to 2400 ft. 
on Helvellyn. 
S. angusta Kiitz. Bn. 
S. splendida (Ehrnb.) Kiitz. Bn. 
S. nobilis Sm. H. (at 2400 ft.). 
8. ovalis Breb. Deepdale. 
8. ovata Kiitz. Near Cockermouth. 
8. minuta Breb. Bo., near Cockermouth. 
8. pinnata Sm. Bn., Threlkeld, Blea Tarn in Borrowdale. 
Genus Cymatopleura Sm. 
C. 8olea (Breb.) Sm. Bo., Bn., Deepdale, Dubbs Moss. 
