JOUENAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



FEBRUARY 1886. 



TRANSACTIONS OF THE SOCIETY. 



I. — Fresh-water Algae (including Chloroplwjllaceous Protoiiihytci) 

 of the English Lake District; with descriptions of twelve 

 new species. 



By Alfred W. Bennett, F.R.M.S., F.L.S., Lecturer on Botany 

 ""at St. Thomas's Hospital. 



(Eead ISth January, 1886.) 



Plates I. and II. 



The following is a record of the fresh-water organisms observed 

 during a six weeks' stay in August and the early part of September 

 1885, in the district between Windermere and Langdale, West- 

 moreland. As nearly every day's observation added some fresh 

 species to the list, it is probable that the record is a very incom- 

 plete one of the microscopic aquatic flora of this very rich district. 



EXPLANATION OF PLATES I. and II. 



Fig. 1. — Ilerismopedia ? paludosa Benn, x 600. 

 2. — Nostoc hyalinum Benn. X 200. 



3. „ „ portion of trichome, with heterocyst x 600. 



4. — Pediastrum compactum Benn. x 400. 

 5. „ „ marginal cell x 1200. 



6. — Micrasterias cornuta Benn. x 200. 

 7. — Ilolocystis oscitans Hass., most perfect form X 200. 



8. „ „ another form x 200. 



9. „ „ dividing x 200. 

 10. „ „ empty frustule x 200. 

 11. — Euastrum multilohatum Wood x 400. 



12. „ ornithocephalum Benn. x 400. 



13. „ Lundellii Benn. x 400. 



14. „ crenatum Ktz., empty frond X 400. 

 \5.^-Co$mariuin Wittrockii Lund, x 400. 

 16. „ oblongum Benn. x 400. 

 17. — Xanthidium spinulosum Benn. x 400. 



Ser. 2.— Vol. VI. B 



