614 Proceedings of the Royal Irish Academy. 



Hydrasna testaeea, Cm-t. 

 Leixsiee. 

 Xilkenny (Thomasto^mi, Ht.). 

 round on the leaves of N'ymjyhcea in the River jS'ore. 



H. riparia, Kug. 

 TJlstee, Cox:^fAUGHT. Leixstek. Mtjis'stee. 

 Common. 



H. nigrita, Germ. 

 Ulstek. ]Mtj:n'sxee. 

 Antrim (Belfast clist., Lagan Canal, B.).— Armagh ('87 J. 2).— • 

 Waterford ('78 P.). 



H. angustata, Sturm. 



UlSTEE. COjSrNAUGHT. MuKSTEE. 



Armagh ('92 J. 1). — Eoscommon (Lough Eee, '98 Ht. 1). — 

 Tipperary (near Borrisoleigh, Sp.). — "Waterford (Dunmore, "Wr.). 



H. gracilis, Germ. 



UlSTEE. LeIXSTER. 



Deny (Eiver Faughan, '00 B.). — "Wicklo-sv (Avonmore, H. coll.). — 

 Kilkenny (Eiver Xore, near Thomastown, Ht.). 



H. atricapilla, AVat. 

 Ulstee. AlrXSTEE. 

 Derry (Eirer Faughan, 1900 B.).— Annagh ('90 J. 2).— Cork 

 (Queenstown, "^"r.). 



Occui's in company Tvith the folloTving species; in weed grooving 

 on stones in streams, and in wet moss. 



H. pulchella, Germ. 

 Ulsiee. Leixstek. 

 Deny (Eiver Faughan, '00 B.). — Antrim and Down (Lagan 

 Canal, B. ; Lough iSTeagh, H. coll.). — Ai'magh ('00 J. 2). — Kilkenny 

 (ThomastoTvn, on Nynqjhoea in the Eiver Xore, Ht.). 



Cyclonotum orbiculare, F. 



Ulstee. Coknatjght. Lees-stee. Mttxstee. 

 Donegal, Deny, Annagh, Feimanagh, Sligo, Galway, Louth, Dublin, 



