New British Freshwater Algse. By William West. 
3 
var. pyramidatum var. n. Fig. 8. 
Yar. semicellulis pyramidatis, lateribus subrectis, ad 
apices latissime truncatis ; isthmo angustiore. 
Long. cell. 10-11 /x ; lat. 8-6-9*6/x; lat. istbm. 
2-2*6 /x ; lat. apic. 5 *8-5 *9 /x ; crass. 4*8 /x. 
Hah. Riccall Common, E. Yorks. 
Genus Fleur ot senium Nag. 
P. truncatum (Breb.) Nag., Gattung. Einz. Alg., p. 104. 
var. granulatum var ; n. 
Var. cum granulis confertis sed distinctis ordinatis, 
ambitu subpapilloso. 
Long. 405 /x ; lat. max. 55 /x. 
Hab. Ben Laoigh, Scotland. 
Genus Glosterium Nitzsch. 
C. abruptum West, Alg. Eng. Lake Distr. in Journ. Iioy. Micr. 
Soc., 1892, p. 719, pi. IX. f. 1. 
forma brevior. Fig. 4. 
Forma cellulis brevioribus curvatioribusque. 
Long. 60-107 /x; lat. 15-16 /x. 
Hab. Ffestiniog, N. Wales. 
C. intermedium Ralfs, Brit. Desm., p. 171, t. xxix. f. 3. 
var. Hibernicum var. n. Fig. 2. 
Yar. cellulis subrectis apices versus subito inclinatis et 
attenuatis ; striis 5 in 8 * 3 /x. 
Long. 290 /x ; lat. 19 /x. 
Hab. Westport, Co. Mayo, Ireland. 
Gl. intermedium Ralfs a. typicum Klebs (Desm. Ost- 
preuss., tab. ii. f. 16 non 15) is probably this variety. 
The two figures of Gl. lineatum Wolle (Desm. 
U.S., pi. vi. fig. 16) are also similar, but a little 
larger and not so truncate at the apices. ^ 
C. subpronum sp. n. Fig. 3. 
C. angustissimum, circiter diametro 100-plo longius, rec- 
tum, levissime curvatum prope apices, lineare, utrinque ab 
medio semicellularum longe attenuatum, apicibus obtusis sed 
angustissimis ; membrana achroa et glabra. 
Long. 427 /x ; lat. 3*7 /x. 
Hab. Malham Tarn, W. Yorks. 
This differs from Gl. pronum Breb. in being much narrower and 
having a colourless membrane without any striation. In relative 
length and breadth this species agrees with Gl. aciculare T. West, 
but is somewhat smaller, and does not begin to taper until half-way 
from the centre to the apices, which are not k< very acute.” 
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