414 Proceedings of the Royal Irish Academy. 



berg, De Danske Diat., p. 82. Donkin, N. H. Brit. Diat., p. 21, 

 PI. iii., fig. 9. 



Lough Mask, near Tourmakeady, Co. Mayo. Ditck near to-wn of 

 TVexford. Eiver near Glencar, Co. Kerry. Kock Mills, Co. Cork. 

 Stream Bellarena, Co. Deny. Glenchree, Kilcool, Co. "VVicklow. 

 EiverDodder, Killakee, Co. Dublin. 



Navicula mesolepta, (Ebr.) Presb water. 



Yalve narro-w, triundulate ; ends narrowed, capitate ; strise costate, 

 radiate. Length -0025, breadth -0006. 



Kiitz. Lac, p. 101, T. xxviii., fig. 33, and T. xxx., fig. 34, who 

 attributes the species to Ehrenberg. Grunow, Verhand. der K. K. 

 Zool. Bot. GeseU., Band x., 1860, p. 520. Ealfs, in Pritch., p. 894. 

 Cleye, Om Svenska och jS'orska Diat., p. 225. — Pinnularia mesolepta, 

 Wm. Sm., B.D., Yol. i., p. 58, PL xix., fig. 182. 



Lough Moume deposit. Common specially in mountain districts. 



Naximda anglica, (Ealfs). Fresh water. 



Yalye broadly elliptical; ends produced; striae costate; conrergent 

 in the middle, radiate towards the ends ; length '0015, breadth' 00066, 

 (Plate 34, fig. 24.) 



EaKs, in Pritch., p. 900, who considers the form identical with 

 ISTavicula tuniida, "Wm. Smith. Donkin, N". H. Brit. Diat., p. 35, 

 PL v., fig. 11. The latter author likewise coincides with EaKs as to 

 the identity of the species with that of Smith referred to. There is, 

 however, a considerable difference between the forms. In I^avicula 

 anglica the valve is larger, the ends less capitate, the stri» more dis- 

 tant than in the case of J^Tavicula tumida ; and whereas in the latter 

 the strife are punctate, in the present form they are plainly costate. 

 Schumann, Diat. der Hohen Tatra, p. 68. 



Killakee. Tiinity College Botanical Gardens, Co. Dublin. Ditch 

 near Sligo. Lough Gill, Co. Kerry. Lough Mask, near Tourmakeady, 

 Co. Mayo. Dundalk, Co. Louth. 



War. siiblinearis, (Donkin). Freshwater. 



Yalve in all respects like the tpyical species, except that the out- 

 line is nearly linear, and the produced ends wider; length '0012, 

 breadth -0005. 



Donkin, IST. H. Brit. Diat., p. 35. PI. v., fig. 11 b. 



Killakee, Co. Dublin. 



Navicula cryptocepliala, (Kiitz.) Fresh water. 



Yalve small, narrow, elliptical, with produced slightly capitate 

 ends. Striae fine, linear radiate ; length -0012, breadth -0003. (Plate 

 34, fig. 25.) 



Kiitz. Bac. p. 95, T. iii., fig. 20. Wm. Sm., B. D., Yol. i., p. 53, 



