-TO URNAL 
OF THE 
ROYAL MICROSCOPICAL SOCIETY. 
FEBRUARY 1894. 
TRANSACTIONS OF THE SOCIETY. 
I . — New British Freshwater Algse. 
By William West, F.L.S., assisted by G. S. West. 
{Read 15 th November , 1893.) 
Plates I. and II. 
None of the following algae have hitherto been recorded for Britain, 
so it was thought that a list of them with descriptions and figures 
would be of interest to all algological as well as other students. 
Mr. R. Y. Tellam of Bodmin kindly collected the Cornish mate- 
rial, and Mr. J. Beanland of Bradford that from Slieve Donard. My 
son Gr. S. West and myself collected the remainder except where 
otherwise stated. 
EXPLANATION OF PLATES. 
(Explicatio iconum.) 
a, a', a", a'"= front view (a fronte visa). I e = side view (a latere visa). 
b, b' = vertical view (a vertice visa). | d = basal view of semicell (a basi visa) 
Plate I. 
Fig. 1 . — Cosmarium exiguum Arch. var. pressum var. n. x 520. 
„ 2 . — Closterium intermedium Ralfs var. Hibernicum var. n. x 520. 
„ 3. „ subpronum sp. n. ax 220 ; a' x 520. 
,, 4. „ abruptum West forma brevior. x 400. 
„ 5. — Penium Clevei Lund var. crassum var. n. X 520. 
„ G Si 7. ,, inconspicuum sp. n. x 520. 
„ 8 . — Spondyhsium pulchellum Arch. var. pyvamidatum var. n. x 520. 
„ 9. — Cylindrocystis diplospora Lund, subsp. major West f. constricta. X 520. 
,, 10 . — Cosmarium subundulatum Wille var. Beanlandii var. n. x 400. 
11. 
9J 
Lundellii Delp. var. elliptieum var. n. 
X 400. 
12. 
99 
Holmiense Lund. var. undatum var. n. 
X 400. 
13. 
99 
furcatospermum sp. n. x 520, 
14. 
99 
promontorium sp. n. X 520. 
15. 
99 
Thwaitesii Ralfs var. Scoticum var. n. 
X 400. 
16. 
prominulum Racib. var. subundulatum var. n. 
17. — Staurastrum amphidoxon sp. n. x 400. 
18. — Cosmarium pyramidaium Breb. var. angustatum var. n. x 520. 
19. „ tetragonum (Nag.) Arch. var. pumilum var. n. x 400. 
20. „ subretusiforme sp. n. x 830. 
21. „ asperum sp. n. x 400. 
22. — Staurastrum lanceolatum Arch. var. compressum var. n. x 520. 
23. — Cosmarium Scoticum sp. n. x 400. 
1894 B 
