JOURNAL 
OF THE 
EOYAL MICROSCOPICAL SOCIETY. 
JUNE 1890. 
TKANSACTIONS OF THE SOCIETY. 
V . — Contribution to the Freshwater Algse of North Wales. 
By Wm. West, F.L.S., Lecturer on Botany and Materia Medica 
at the Bradford Technical College. 
{Read April, 1890.) 
Plates V. and VI. 
In 1881, an excellent list of species of Desmids found at Capel Curig 
was published in the ‘ Midland Naturalist ’ by Mr. A. W. Wills. 
Since then my esteemed and enthusiastic friend Mr. J. H. Lewis, F.L.S., 
of Liverpool, has most kindly sent me many good and repeated 
gatherings which he has made at the same place, as well as at 
Festiniog, Dolgelly, Llyn Padarn, Dolbadarn Castle, Llandudno, Moel 
Fammau, and on Snowdon. I have also to thank my son, G. S. West, 
EXPLANATION OF PLATES V. AND VI. 
(Explicatio iconum.) 
a — front view (a fronte visa). 
6 = vertical view (a vertice visa). 
c = side view (a latere visa). 
All the figures are drawn from nature to a uniform scale of 400 diameters (icones 
omues 400/1). 
Plate V. 
Fig. 1. — Gonntozygon minutuni iiov. sp. 
„ 2. — Resmidium coarctatum Nord. var. camhricum nov. var. 
„ 3. — Staurastrum margaritaceum Meneg. var. coronulatam nov. var. 
„ 4. — „ hacillare Breb. /3 obesum Lund. 
„ 5. — „ cumhricum nov. sp. 
„ 6. — „ „ „ var. camhricum nov. var. 
„ 7. — „ osteonum ,, 
„ 8. — „ coarctatum Bre'b. var. subcurtum Nord. 
„ 9. — „ iotanum Wolle. 
5 , 10. — Arthrodesmus tenuissimus Arch. 
„ 11. — Staurastrum furcatum Ehrb. var. 
„ 12. — „ anatinum Cooke & Wills. 
„ 13. — Micrasterias Americana (Ehrb.) Ralfs var. Lexoisiana nov. var. 
„ 14. — Staurastrum muricatum Bieb. var. acutum nov. var. 
„ 15. — „ Ophiura Lund, forma nonaradiaia. 
„ 16. — „ cyrtocerum Brc% forma tetragona. 
1890. 
u 
