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Transactions of the Society. 
Genus Staurosper^num Ktz. 
S. viride Ktz. P. 
Order Zyqnemace^. 
Genus Spirogyra Link. 
S. crassa Ktz. B. 
S. nitida (Dillw.) Link. A. 
S. longata Yauch. B., P., Aber. 
S. flaveseens Cleve. Do., P., C. 
S. Weheri Ktz. C. 
S. temiissima Hass. C. 
Genus Zygnema Ktz. 
Z. cruciatum (Vauch.). B., C. 
Z. stellinum (Vauch.) Ktz. C., A. 
Z. Vaucherii Ag. B., Llyn Idwal. 
Var. subtile Eabh. Llyn Idwal. 
Z. anomaluin (Hass.). S., B., Bettws-y-coed. 
Genus Zygogonium Ktz. 
Z. erieetorum De Bary var. terrestre (Z. ericetorum Ktz). 
Frequent. 
Var. aquaticum {Z. Agardhii Babb.). Frequent. 
Order Desmidiace.®. 
Genus Gonatozygon De Bary. 
*G. pilosum Wolle. C. 
This was only 11 ya in diameter, Wolle’s were 15 ya. 
G. Bal/sii De Bary. P. 
G. Brehissonii De Bary. Do., B., P. 
G. MiNUTUM nov. sp. Fig. 1. 
G. cellulis subcylindricis, apicem versus angustatis, utroque 
polo constrictis, vicies longius quam latum, cytodermate dense 
subgranulato. 
Lat. medio, 3 * 7 ya ; infra apices, 2 * 5 ya. 
About twenty times as long as broad, slightly swollen 
towards the middle and constricted under the apices, cytoderm 
densely but slightly granulate. C. 
I have also collected this species at Brothers Water, in Westmore- 
land, and at Riccall, in the East Biding of Yorkshire. 
Genus Sphserozosma Corda. 
S. excavatum Balfs. S., P., Do. 
S. pygmmim Cooke. C., Do. 
