ALGA OF WEST IRELAND. 185 



This subspecies differs from St aurast rum Pseudosebaldi, Wille, 

 var. bicorne, Boldt. (Siber. Chloroph. tab. 6. fig. 36), in the straighter 

 processes of the end view, and in the presence of the warts at 

 the base of the bifurcate processes. It differs from 8. Pseudo- 

 sebaldi, Wille, *ton8um, Nord. (Fr. Wat. Alg. of New Zeal. & 

 Austr. p. 36, tab. 4. fig. 4), in the non-fusiform shape of the end 

 view as well as in the not reduced apical warts. 



* 



f7l. Staurastrum Manteldtit, Delp. {Desm. Subalp. p. 160. 

 tab. J 3. fig. 12.) 



Long. 46 fx ; lat. cum proc. 77 /i ; lat. isthm. 10 /i. 

 I. Ballynahinch. 



72. S. anattntjm, Cooke et Wills. (Grevillea, 1880, p. 92, 

 tab. 139. fig. 6.) 



Long. 55 fi; lat. (cum proc.) 75-85 /i; lat. isthm. 18 fi. 



I. Ballynahinch; Arderry Lough; Lakes east of Lough 

 Bofin ; Oorid Lough ; Lakes, Clifden to Eoundstone. — II. Upper 

 Lake of Killarney ; Glen Caragh ; Adrigole ; Sugar Loaf Mt. ; 

 8 miles S. of Kenmare. 



ttVar. truncatum, nov. var. (PJ. XXIV. fig. 2.) 

 Var, cum apicibus semicellularum truncatis et verrucis minori- 

 bus ; angulis contractis ad bases radiorum. 



Long. 58-65 yu; lat. cum proc. 95-100 ^ ; lat. isthm. 18-20 fi. 



II. Lough G-uitane. 



ft* biradiatum", nov. subsp. (PI. XXIV. fig. 3.) 

 S. submagnum, duplo latius quam longius (cum processibus), 

 profunde constrictum, sinu sublineari ; semicellulse obverse 



( 



granu 



trifidis, dorso levissime convexo, verrucis numerosis emarginato- 

 bifidis, serie verrucarum similarum intra marginem ; a vertice 

 visae fusiformes, utrinque verrucis numerosis emarginato-bifidis 

 mstructis, serie una verrucarum similarum intra marginem 

 unumquemque, processibus granulatis apicibus trifurcatis. 



Long. 40 /x ; lat. cum proc. 82 fx ; lat. isthm. 8 ft ; crass. 23 /i. 



L Lakes near Recess. 



7tt. S. eustepha> t um, Halfs. {Brit. Desm. p. 215.) 



L Lakes, Clifden to Roundstone ; Ballynahinch. — II. Gleu 

 Caragh. 



P 



