8 
Transactions of the Society. 
Dartmoor. No locality is ^iiven in Cooke’s ‘Brit. Fresh-water Algm,’ 
but Mr. West has gathered it in Yorkshire. 
Cosmarium cucumis Cord., H, D. 
„ Ealfsii Breb., H, D. 
* „ pachydermum Lund., D. 
„ pyramidatum Breb., H, D. 
„ pseudo-pyramidatnm Lund., II. 
„ Brebissoiiii Men., H, D. 
„ margaritiferum Men., II. 
,, botrytis Men., H, D. 
* ,, prsemorsum Breb., H. 
* „ ochthodes Nordst., H. 
„ ornatiim Balls, H. 
„ Broomei Thw., H. 
This is certainly a true freshwater species. 
Cosmarium speciosum Lund., H. 
* „ prsegrande Lund., H. 
See Note at the end of this paper. 
* Cosmarium glohosum Buln., H, D. 
„ cucurbita Breb., H. 
„ attenuatum Breb., D. 
„ turgidum Breb., H. 
Xanthidium armatum Breb., H, D. 
„ aculeatum Ehrb., H. 
Arthrodesmus incus Hass., H. 
Staurastrum cuspidatum Breb., D. 
„ avicula, Breb., H. 
„ Beinschii Boy, D. 
„ hirsutum Breb., H. 
„ teliferum Balfs, H, D. 
„ Pringsheimii Beinsch, H, D. 
This appears to be a widely distributed species. 
Staurastrum spongiosum Breb., H. 
„ muticum Breb., H, D. 
„ alternans Breb., H. 
„ polymorphum Breb., H. 
„ proboscideum Arch., H. 
Zygnemace^. 
Spirogyra longata Vauch., H. 
Seen in lateral conjugation. 
Spirogyra porticalis Vauch., H. 
