174 MR. W. WEST ON THE FRESHWATER 



Forma processibus apice bifidioribus. 



Long. 50 n ; lat. 46 \x ; lat. isthm. 16 \x. 



I. Nacoogarrow Lough. — II. Carrantuohill. 



19. Stafrastrum ayicula, Breb. in Balfs, Brit. Desm. p. 140, 

 tab- 23. fig. 11. 



I. Lough Shannacloontippen ; Clifden ; Lakes E. of Lough 



Bofin. — II. Carrantuohill. 



ftYar. yerrucosfm, nov. var. (PL XXIII. fig. 2.) 



Var. membrana distincte verrucosa. 



Long- 22-5-26 /i ; lat. 33-37 p ; lat. isthm. 10 /i. 



I. Lerryclare Lough ; Lakes east of Lough Bofin. — II. Clo- 

 gerheen ; Adrigole. 



St. subarcuatum, Wolle, probably belongs to this species, as he 

 surmised it might do ; if so, it will fall under this variety. 



20. S. eurcatum, Breb. (Balk. M. Eur op. Alg. iii. p. 218.) 



I. Near "Westport ; Ballynahinch ; Kylemore. — II. Lough 

 Guitane; near Lough Brin ; Castletown; Carrantuohill. 



Var. armigerfm, Babli. (Fl. Burop. Alg. iii. P- 218.) 

 [S. armigerum, Breb.~\ 



II. Adrigole ; Lower Lake of Killarney. 



21. S. monticttlositm, Breb. (Balfs, Brit. Besni. p. 130, 

 tab. 34. fig. 9.) 



II. Carrantuohill. 



22. S. Eeinschii, Boy. 



Forma trigona. 



I. Lakes, Clifden to Eoundstone ; Kylemore ; Ballynahinch ; 

 Boundstone ; Lakes near Recess ; Oorid Lough ; Creggan 

 Lough. — II. Lough Gruitane ; Glen Caragh ; Lower Lake ot 

 Killarney. 



Forma tetragona. 

 II. Carrantuohill. 



fig. 3. 



lial/i 



Uynah 



Carran 



tuohill ; Adrigole ; Lower Lake of Killarney ; Castletown. 



