6 Transactions of the Society. 



Cosmarium Broomei Thw. 



„ spliericum Benn. (in Journ. R Micr. Soc., 1887, 



p. 10). Occasional. 



„ ochthodes Nords. 



„ speciosurn Lund. Occasional. ) 



Calocylindrus annulatus dBy. Bog pools ; not unfrequent. 

 Xantbidium antilopeum Breb. Bog pools ; occasional. 



No British locality is given by Dr. Cooke, but it has been gathered 

 in this district by Mr. Bisset. 



Xantbidium cristatum Breb. 

 Arthrodesmus octocornis Ehrb. 

 Staurastrum armigerum Breb. 



., spongiosum Breb, var. cumbricum n. var. 



Figs. 15, 16. 



Side view somewhat longer than broad, about 00 /x long, 50 /n wide ; 

 each segment elliptical, with an oval protuberance in front, covered 

 with hyaline bifurcate processes. Front view triangular, with slightly 

 convex sides and obtuse angles, about 48-52 /j. in diameter, completely 

 covered with bifurcate hyaline processes. Slightly larger than the 

 typical form, not so orbicular in outline, and distinguished by the pro- 

 tuberance on each segment. Moss pool, Grange-in-Borrowdale. 



Staurastrum pygmmum Breb. 



Length 23 /x ; breadth 26 /x ; each segment nearly elliptical. Pool 

 near Derwentwater. 



Staurastrum tumidum Breb. 



This fine desmid was not unfrequently seen ; always inclosed in 

 dense hyaline jelly. 



Staurastrum cornubiense Benn. (in Journ. K. Micr. Soc, 1887, 

 p. 11). 

 ,, brachiatum Ralfs. 



„ tricorne Breb. 



„ inflexum Breb. 



„ paradoxum Mey. 



„ proboscideum Breb. 



„ aculeatum Menegh. 



Zygnemace^;. 

 Zygnema pectinatum Ag. 



MES0CARPE2E. 



Staurospermum capucinum Ktz. 



