O'Meara — Rejmrt on the Irish Dktomacece. 411 



JSfavicula heujleri, (Gmnow). Fresh crater. 



Yalve very small ; lanceolate ; central nodule large, Strige fine ; 

 linear, radiate; length about -0009, breadth about -0003. (Plate 

 34. fig. 15.) 



Grunow, Yerhand. der K. K. Zool. Bot. GeselL, Band x., 1860, 

 p. 528, T. iii., fig. 32. Schumann, Diat. der Hohen Tatra., p. 68. 

 Eab. Fl. Eur. Alg., sect, i., p. 214. 



Lough Gill, Co. Keny. Powerscourt, Co. "\Vicklo"vv. 



Naviculafortis, (Gregory). Marine. 



Yalye small ; broadly lanceolate ; rounded at ends. Striae costate, 

 convergent in the middle, radiate toTvards the ends ; on front \iew, 

 frustiile slightly constricted, Tvith the angles slightly rounded ; length 

 •0017, breadth -0006. 



Ealfs, in Pritch., p. 905. Donkin, ^. H. Brit. Diat., p. 57, 

 PI. viii., fig. 8. — Pinnularia fortis, Gregory, Q. J. M. S., Trans., 

 1856, p. 47, PI. v., fig. 19. Eab. PI. Eui-. Alg., sect, i., p. 215. 



Lough Gill, Co. Kerrv. Arran Islands, Co. Galway. ITalahide, 

 Co. Dublin. 



Navicula nortliumlrica, (Donkin). Marine. 



Yalve narrow, lanceolate; ends acute. Striae linear, convergent in 

 middle, -^here they are strongly marked; length -0019, breadth 

 •0004. Prustule on front view slightly constricted. (Plate 34, 

 fig. 16.) 



Donkin, Q. J. M. S., 1861, p. 9, PI. i., fig. 5 ; K H. Biit. Diat., 

 p. 54, PL viii., fig. 1. Eab. PL Eur. Alg., sect, i., p. 175. 



Bannow, Co. "Wexford. Salt ditches near the town of Gal way. 



NavkuJa arenaria, (Donkin). Marine. 



Yalve lanceolate, narrow; ends acute, produced and slightly 

 constricted. Strige costate, convergent; length •OOig, breadth -0004. 

 Prustule on front view very slightly constricted. (Plate 34, fig. 17.) 



Donkin, Q. J. M. S., 1861, p. 10, PI. i., fig. 9; JN". H. Brit. Diat., 

 p. 56, PI. viii., fig. 5. Eab. Fl. Eur. Alg., sect, i., p. 177. 



Portmamock, Co. Dublin, 



Navicula inflexa, (Gregory). Marine. 



Yalve lanceolate; slightly depressed at the extremities, Stiite 

 costate, convergent; length •OOIS, breadth -0004. (Plate 34 

 fig, 18.) 



Ealfs, in Pritch., p. 905. Donkin, jS". H. Brit. Diat., p. 54, 



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