AliGiE OF WEST IRELAND. 147 



Long. 12*5-15 /x; lat. 10-12-5 /i; lat. isthm. 5 tz; crass. 45- 

 7*5 /i ; diam. zygosp. 12*5-15 /x. 



I. Lough Aunierin (cum zygosp.). — II. Lough. Gruitane (cum 

 zygosp.) ; near Lough Brin ; Lower Lake of Killarney. 



31. Cosmahium tkuncatellum, Rabh. (Fl. Eur op. Alg. iii. 



p. 165.) 



I. Moher Lough. 



32. C. tenue, Arch. 



(Cooke, Brit. Desm. p. 92.) (PL XX. 

 fig. 25.) 



Long. 14-10 fi ; lat. 13*5-15*5 ft ; lat. isthin. 3"5-4 # 5 fx ; crass. 



8'5 fi ; diam. zygosp. 22-23 fi. 



This agrees well with Archer's description of the species ; it is 

 about as long as broad aud has a colourless membrane. 



L Lakes east of Lough Bofia (cum zygosp.) ; Derryclare Lough 

 (cum zygosp.). 



33. C. EXIGUUM, Arch. (Rahb. Fl. JEurop. Alg. iii. p. 164.) 

 Long. 25-29 /x; lat. 15-16 /i; lat. istbm. 3-4 /x; crass. 10//. 

 I. Athry Lough ; Lough Aunierin ; Lakes, Clifden to Round- 

 stone ; Lakes east of Lough Bofin ; Ballynahinch ; Derryclare 



Lough. — II. Carrantuohill ; Castletown. 



t34. C. ixipressulum, Elf v. [C. Meneghinii, Breb., f. Reinschii, 

 Istv. (Diag. Alg. Nov. Hung. p. 8). — C. Meneghinii, Breb., 

 forma, Reinsch (Contrib. Alg. et Fung. p. 88, tab. 12. fig. 12a 

 et &).] 



Long. 26-27 /x ; lat. 17-18 p ; lat. isthm. 6-7 /x. 



I. Ballynahinch ; Baheh Loughs ; Lakes near Recess ; Boy 

 Lough ; Moher Lough ; Derryclare Lough ; Nacoogarrow Lough ; 

 Grlendalough ; Shindilla Lough. — II. Lough Gruitane. 



i 35. C. yenustum, Arch, in JPritch. In/us. ed. 1861, p. 732. 



I. Near Westport; near Oughterard; Lakes, Clifden to 

 Roundstone ; Ballynahinch ; Athry Lough ; Arderry Lough. 

 II. Lough Gruitane ; G-len Caragh ; Lower Lake of Killarney. 



fForma. minoe, Wille. (Ferskv. Alg.f. Nov. Semi. p. 43.) 

 Long. 21 fx ; lat. 16 /x ; lat. isthm. 6 /i. 

 I. Baheh Loughs. 



ttVar. hypohexagoxtjm, nov. var. (PL XXI. fig. 1.) 

 Semicellul® truncato-pyramidatse, marginibus lateralibus in- 





