280 
Transactions of the Society, 
A variety of Euastrmi verrueosum Ehrb. with a more gaping 
sinus than usual, and a sub-rectangular polar lobe, is figured, 
fig. 26. 
As the figures of Staurastrum anatinum Cooke & Wills, as pub- 
lished by Cooke differ so greatly, I thought it best to give a figure of 
the form which was abundantly seen from Capel Curig ; Cooke’s figure 
in ‘Grevillea’ is nearer the form herein figured than the one in his 
‘ British Desmids,’ fig. 12. The extremities of the processes often 
appear as in fig. 12 cl, caused by the spines being placed somewhat 
vertically over each other. 
A figure of a Docidium is given which I have not been able to 
identify satisfactorily. Fig. 29. 
Those species and varieties prefixed by an asterisk are hitherto 
unrecorded for Britain. 
Since this was in manuscript, two of the species which would 
have been new records for Britain, have been published as occurring in 
Northern Scotland, by Mr. Koy (‘ Scottish Naturalist,’ Jan. 1890). 
These interesting species are Cosmarium suberenatum Hantsch, and 
C. contr actum Kirch. 
The following contractions are used for the chief localities : — 
A. for Llyn Coron, Anglesea; Do. for Dolbadarn Castle; B. for 
Bethesda ; F. for Festiniog ; C. for Capel Curig ; P. for Llyn Padarn ; 
D. for Dolgelly ; S. for Snowdon. 
ALG^. 
Class Floride^. 
Order HELMINTHOCLADIEiE. 
Genus Batrachospermimi Both. 
B. moniliforme Roth. A., C. 
B. vagum (Roth.) Ag. B. 
Class CoNVERvoiDE^ Heterogam^. 
Order (EDOGONiACEiE. 
Genus (Edogonium Link. 
(E. cry^toporum Wittr. F. 
E. pluviale Nord. C. 
E. tenellum Ktz. C. 
Several other species of this genus were seen, but not in proper 
condition for satisfactory identification. 
Genus Bulbochsete Ag. 
B. setigera Ag. C., A., Llyn Idwal. 
B. rectangidaris Wittr. C. 
