ALGiE OF WEST IRELAND. 1G9 



tVar. americanus, nob. [A. Incus, Ilass., var. americanus, 

 TV. Turn. (Some new and rare Desm., in Jo urn. Roy. 



Micr. Soc, Dec. 1885, p. 937, pi. 16. fig. 17).] 

 Var. marginibus latcralibus convexioribus, a vertice visa) 



cellulis latioribus. 



Long. 27 /x; lat. sine spin. 225 /x; lat. cum spin. G5 /j ; long. 



spin. 22^ ; lat. istlim. 9 \x ; crass. 11 ^. 



I. Lakes, Clifden to Roundstone, and near Recess. 



5. Artiikodes^ius lo^gtcorists, Boy (in lit. cum icone). 

 Long. 23 /jl ; lat. cum spin. 62^; lat. isthm. 7'5/x. 

 I. Derryclare Lough. 



6, A. convergers, Ehrenb. (Balfs, Brit. Desm. p. 118, 

 tab. 20. fig. 3.) 



L Ballynahinch ; Creggan Lough ; Derryclare Lough ; Clif- 

 den. — II. Clogerheen ; Glen Caragh. 



tf7. A. elegans, nov. sp. (PL XXIL fig. 7.) 



A. mediocre, paulo longior quam latius (sine aculeis), pro- 

 f unde constrictus, sinu subrectangulari extremo obtuso ; semi- 

 cellulae obverse semiorbiculares, marginibus latcralibus superi- 

 oribus in spinis longis et subconvergentibus attenuates, spinis 

 binis brevibus delicatis truncato-bifurcatis intra margines 

 laterales ornatae, dorso convexo spinis 6-8 brevibus delicatis 

 truncato-bifurcatis ornate ; a vertice visa* ellipticse, spinas breves 

 longasque ostendentes ; membrana glabra. 



Long, sine proc. 30 /i; long cum proc. 38 /x ; lat. sine spin. 

 27 /x; lat. cum spin. 65^; long. spin. 20-22 /x; lat. isthm. 

 10 fi ; crass, sine proc. 13 /j. ; crass, cum proc. 25 p. 



L Ballynahinch. 



8. A. bifidus, Breb., var. truncatus, West. (Journ. Bot. 

 Oct. 1889, tab. 291. fig. 9.) 



L Ballynahinch; Lakes, Clifden to Roundstone ; Derryclare 



Lough. 



ft Var. latodivergens, nov. var. (PL XXIL fig. 8.) 



A. minimus ; tarn longus quam latus, sinu late exciso ; senu- 



fellulae obverse triangulares, marginibus lateralibus subrectis 



apice recto, spinis duabus late divergentibus ad angulum unum 



unumquemque ; a vertice vis® elliptic®, spina una ad polum unuin- 



quemque ; membrana glabra. 



o2 



