New British Freshwater Algse. By William West . 
17 
D. Baueriana (Grim.) Bornet et Flahault (Revis. des Nostoc. 
Heterocyst, p. 375). 
var. Hibernica var. n. 
Var. vagina crassiore, lamellosa ; trichomatibus crassi- 
oribus ; articulis 3-plo brevioribus prope basim. 
Crass, vag. 23 ya ; crass, tricb. 9* 5-11 *5 ya ; diam. 
beterocyst. 12 *12 *5 /a. 
Bab. Slieve Donard, Co. Down, Ireland. This oc- 
curred sparingly with the last. 
This variety differs considerably from the type in its thicker 
sheath, thicker tricbomes, and shorter joints. The beterocysts are 
subbemispberical or semi-elliptical. It may be another species; 
it was only seen in small quantity. 
Order Chroococcace^:. 
Genus Chroococcus Nag. 
C. minor (Kiitz.) Nag. (Gattungen einzelliger Algen, p. 47, t. 1 a, 
f. 4) ; Rabb. FI. Europ. Alg., ii. p. 30 [Protococcus minor 
Kiitz.] . 
f. MAJOR. 
Diam. cell, sine tegumento 4-5 ya. 
Bab. Cronkley Fell, N. Yorks ; Llyn-y-cwm-ffynon and 
Llyn Ogwen, Carnarvonshire, N. Wales. 
Genus Gloeothece Nag. 
G. linearis Nag. (Gatt. einzell. Alg., p. 58, t. 1 g, f. 2) ; Rabb. 
FI. Europ. Alg. ii. p. 60. 
Forma cum cellulis diametro 10-12-plo longioribus. 
Diam. cell, sine teg. 1*3 ya ; long. cell. 13-5-15*5 ya. 
Bab. Llyn Teyrn, Snowdon, N. Wales. 
Genus Aphanothece Nag. 
A. saxicola Nag. (Gatt. einzell. Alg., p. 58, t. 1 g, f. 1) ; Rabh. 
FI. Europ. Alg., ii. p. 60. 
var. violacea var. n. ' 
Yar. cytioplasmate cellularum violaceo. 
Diam. cell. 1 * 9-2 * 1 ya ; long. cell. 3-3 * 5 ya. 
Bab. New Forest, Hampshire. Small floating gela- 
tinous patches of a dark violet colour, 
var. SPH 2 ERICA var. n. 
Yar. cellulis sphaericis subsphsericisve. 
Diam. cell. 1 * 4-1 * 7 ya. 
Bab. Llyn Teyrn, Snowdon, N. Wales. 
This may be distinct, the cells being smaller than the other 
variety noticed, and almost uniform in shape ; their diameter agrees 
with the smallest forms of the species. This is like the other forms 
of this genus except in the shape of the cells, and does not belong to 
Aphanocapsa, on account of the method of division of its cells. 
1894 c 
