ALOJ3 OF WEST IRELAND. 139 



18. Euastrum elegans, Kuetz. (Balfs, Brit. Desm. p. 89, 

 tab. 14. fig. 7.) Forma, PI. XX. fig. 12. 



I. Arderry, Nacoogarrow, Letereeu, Athry, Boy, Creggan, 

 Derryclare, Aunierin, Shannacloontippen, and Moher Loughs; 

 Ballynahinch; Clifden ; Glendalough ; near Oughterard; near 

 Recess; Roundstone ; near Westport; Lakes E. of Lough Bofin. 



II. Loughs Guitane and Cloonee ; Cromagloun ; Muckross ; 

 Tore Mt. ; Carrantuohill ; near Lough Brin ; Adrigole ; Castle- 



town ; Upper and Lower Lakes of Killarney. 



Var. bidentata, Naeg. [? E. elegans, Kuetz ^ ft. speci- 

 osum, Boltlt. (Desm. Gronl. p. 7, tab. 1. figs. 10 & 11).] 

 I. Creggan Lough; Lakes E. of Lough Bofin; near Ough- 



terard. 



tl9. E. pictum, Boerg. 



) 



I. Oorid Lough ; Arderry Lough ; Lakes near Recess. — II. 

 Glen Caragh ; Lough Gruitane ; Castletown ; Carrantuohill. 



20. E. inerme, Lund. (Desm. Suec. p. 20, tab. 2. fig. 3.) 

 Long. 50-60 /x ; lat. 30-32*5 /x ; lat. isthm. 7*5-8 /x ; crass. 20 /x. 

 I. Athry, Aunierin and Der^clare Loughs ; Ballynahinch. 

 II. Castletown ; GlengarrifF. 



tt21. E. PYRAMIDATUM, nOV. Sp. (PI. XX. fig. 13.) 



E. parvuin, diametro subduplo longius, profunde constrictutn, 

 sinu lineari extremo ampliato, semicellulse pyramido-truncatae, 

 lateribus concavis apicem versus, undulis duabus levissimis 

 prope basin, subemarginatse apice ; a vertice visse rhomboidese, 

 angulis rotundatis et lateribus convexis ; a latere visse trigono- 

 pyramidatae, lateribus concavis ; membrana laevis ; pyrenoidibus 



singulis. 



Long. 25-27 /x; lat. ad bas. semicell. 16-18 xx; lat. ad apic. 



5-4 



I. Ballynahinch ; Kylemore ; Roundstone. 

 Compare with Cosmarium sublobatum (Breb.), Arch. 



22. E. binale, Balfs. (Brit. Desm. p. 90, tab. 14. fig. 8.) 

 I. Ballynahinch ; Creggan Lough ; Kylemore ; near Recess ; 



Lough Shindilla ; Lough Aunierin ; Lough Shaunacloontippen . 



near Oughterard ; near Westport. — II. Lough Guitane ; Upper 



