L'ENIUM. l ( '-"> 



Var. polonicmn (Racib) West. (PI. X, fig. 10.) 



Var. polonicmn (Kacib.) West, Alg. W. Ireland, 1892, p. 130; West <fc 



G. S. West, Alg. N. Ireland, 1902, p. 22. 

 Penium (Docidium ?) polonicum Kacib. Nonn. Desm. Polon. ISSo, p. 61, 



t. 5, f. 12 ; Nordst. Index Desm. 1S9G, p. 203. 



Semicells gradually and strikingly attenuated towards 

 the apices, which are rounded; cells 1011 times 

 longer than their diameter. 



Length 104-165 /i ; breadth 1O5-15 /u ; breadth near 

 the apex 3'5-G //. 



SCOTLAND. Rhiconich, Sutherland ! X. Uist, Outer 

 Hebrides ! 



IRELAND. Cromagloun, Kerry ! Glendoan, Donegal ! 



( < <'0[j r. D /* trihiit in 1 1 . Poland . 



Var. crassum West. (PL X, figs. H-lo.) 



Var. crassum West, Alg. W. Ireland, 1892, p. 130, t. 20, f. 1-3 (inclus. 

 i.punctata and f. inftata) ; West & G. S. West. Welw. Afric. Freslnv. 

 Alg. 1897, p. 78 ; Seine Desm. U. S. 1898, p. 282 ; Alg. N. Ireland, Itlu2, 



p. 22. 



Cells stout, sometimes a little inflated, 4-4-| times 

 longer than their diameter, apices very broad and 

 truncate. 



Length 46-98 /t; breadth 10-21 p. 



WALES. Llyn-an-afon, Carnarvonshire ! 



SCOTLAND. Rhiconich, Sutherland ! Loch Luichart, 

 Ross ! 



IRELAND. Ballynahinch and Nacoogarrow Lough, 

 Galway ! Adrigole and Carrantuohill, Kerry ! Near 

 Gweedore, Donegal ! 



Geogr. Distribution. Lapland. West Africa. Brazil. 



Var. undulatum West. (PL X, fig. 7.) 



Var. undulatum West, Alg. W. Ireland, 1892, p. 130, t. 20, f . 4. 



Semicells regularly but very slightly 5-undulate. 

 Length 101 JJL ; breadth near base of semicells 1 2 - o ju, 

 near apex 9 p. 



IRELAND. Cromagloun, Kerry ! 



