JOURNAL 
OF THE 
ROYAL MICROSCOPICAL SOCIETY. 
DECEMBER 1892. 
TRANSACTIONS OF THE SOCIETY. 
XI . — Algse of the English Lake District . 
By Wm. West, F.L.S. 
(Bead 1 6th November , 1892.) 
Plates IX. and X. 
Several valuable papers have already appeared in tbis Journal 
relating to this subject ; there was one by Mr. Bissett in 1884, and 
since that, two by Mr. A. W. Bennett in 1886 and 1888. As I have 
practically made collections yearly since 1879 from numerous localities, 
I am enabled to offer the following contribution to the already large 
EXPLANATION OF PLATES. 
(Explicatio iconum.) 
a , a', a " «= front view (a fronte visa). 
5, b' = vertical view (a vertice visa). 
c = side view (a latere visa). 
d = basal view of semicell (a hasi visa). 
Plate IX. 
Fig. 1. — Closterium abruptum sp. n. x 520. 
„ 2. „ turgidum Ehrnb. var. decoratum var. n. Cell membrane x 830. 
„ 3. — Sphserozosma vertebratum (Breb.) Ralfs forma minor West, x 520. 
„ 4. — Spondylosium pygmasum (Cooke) West var. compressum var. n. x 400. 
„ 5. — Micrasterias denticulata Breb. var. subnotata var. n. x .220. 
„ 6. — Euastrum binale (Turp.) Ralfs var. retusum var. n. x 520. 
„ 7. — Penium sp. X 520. 
,, 8. — Cosmarium obcunealum West forma, x 520. 
„ 9. — Euastrum elegans (Breb.) Kiitz. var. ornatuni var. n. x 520. 
„ 10. — Cosmarium morsum sp. n. x 520. 
,, 11. „ coarctatum sp. n. x 520. 
„ 12. „ Holmiense Lund. var. integrum Lund forma, x 400. 
„ 13. — Closterium obtusum Breb. forma, x 520. 
„ 14. — Cosmarium Meneghinii Breb. forma (c. zygosp.). x 520. 
,, 15. „ obliquum Nordst. forma minima, x 520. 
„ 16. pseudarctoum Nordst. x 520. 
„ 17. — Euastrum erosum Lund. var. notabile var. n. x 520. 
„ 18. — Cosmarium subpunctulatum Nordst. var. Boergesenii West forma, x 520. 
„ 19. „ cyclicum Lund. var. angulatum West, x 520. 
„ 20. „ RegnelUi Wille forms, x 520. 
„ 21. „ pseudatlantlioideum sp. n. x 520. 
„ 22. „ subcylindricum sp. n. x 520. 
1892. 8 o 
