4 Transactions of the Society. 



Pseudocysts light blue-green ; those near the periphery of the tegu- 

 ment comparatively large, 6-10 11 in diameter, and loosely scattered ; 

 those towards the centre much smaller and more crowded. Bog pool 

 near the Bowder-stone ; not unfrequent. 



I have much hesitation in placing this organism under Kiitzing's 

 genus Gomjrfiosphseria, as its inclusion would require the modification 

 of the character from which the name of the genus is taken, the 

 wedge-shaped form of the pseudocysts. On the other hand, it shows 

 a striking resemblance in the interspersal of a large number of minute 

 pseudocysts among a smaller number of larger peripheral ones. If 

 this is regarded as the more important character, the diagnosis of the 

 genus will have to be modified accordingly. 



Aphanoeapsa montana Cram. Bog pools ; not unfrequent. 



OSCILLARIACE-E. 



Oscillaria princeps Vauch. Occasional. 

 Symploca Kalfsiana Ktz. Among Sphagnum. 



ScytonemacejE. 



Tolypothrix aegagropila Ktz. Bog pools. 

 „ flaccida Ktz. Bog pools. 



BlVULARIACE-E. 



Calothrix minuta n. sp. Fig. 11. 



Sheaths about 12 ■ 5-20 /x in diameter, and 2-6 times as long as 

 broad, yellowish-brown, several grouped together in tufts. Filaments 

 several within each sheath, excessively fine, moniliform, very pale blue- 

 green. Heterocysts basal, colourless, visible within the sheath. Bog 

 pool, Borrowdale ; seen only floating, but probably attached in tufts 

 to other algae. 



Nostocace^e. 



Anabaena flos -aquae Ktz. 



[Nostoc hyalinum Benn. Occasional.] 



ALGM 



Pediastre^:. 

 Pediastrum rotula Br. 



SORASTRE.E. 



Sorastrum bidentatum Pieinsch. 



PANDORINEiE. 



Eudorina elegans Ehrb. 

 Gonium pectorale Mull. 



