414 Proceedings of the Royal Lrish Academy. 
berg, De Danske Diat., p. 82. Donkin, N. H. Brit. Diat., p. 21, 
Fig), ae, 9. 
Lough Mask, near Tourmakeady, Co. Mayo. Ditch near town of 
Wexford. River near Glencar, Co. Kerry. Rock Mills, Co. Cork. 
Stream Bellarena, Co. Derry. Glenchree, Kilcool, Co. Wicklow. 
RiverDodder, Killakee, Co. Dublin. 
Navicula mesolepta, (Ehr.) Fresh water. 
Valve narrow, triundulate; ends narrowed, capitate; striz costate, 
radiate. Length -0025, breadth :0006. 
Kitz. Bac., p. 101, T. xxviii., fig. 88, and T. xxx., fig. 34, who 
attributes the species to Ehrenberg. Grunow, Verhand. der K. K. 
Zool. Bot. Gesell., Band x., 1860, p. 520. Ralfs, in Pritch., p. 894. 
Cleve, Om Svenska och Norska Diat., p. 225.—Pinnularia mesolepta, 
Wt. Sm BoD. Voli. p.. 58, Ph xi, es e2. 
Lough Mourne deposit. Common specially in mountain districts. 
Navicula anglica, (Ralfs). Fresh water. 
Valve broadly elliptical; ends produced ; striz costate; convergent 
in the middle, radiate towards the ends; length :0015, breadth:00066, 
(Plate 34, fig. 24.) 
Ralfs, in Pritch., p. 900, who considers the form identical with 
Navicula tumida, Wm. Smith. Donkin, N. H. Brit. Diat., p. 35, 
Pl. v., fig. 11. The latter author likewise coincides with Ralfs as to 
the identity of the species with that of Smith referred to. There is, 
however, a considerable difference between the forms. In Navicula 
anglica the valve is larger, the ends less capitate, the striz more dis- 
tant than in the case of Navicula tumida; and whereas in the latter 
the striz are punctate, in the present form they are plainly costate. 
Schumann, Diat. der Hohen Tatra, p. 68. 
Killakee. Trinity College Botanical Gardens, Co. Dublin. Ditch 
near Sligo. Lough Gill, Co. Kerry. Lough Mask, near Tourmakeady, 
Co. Mayo. Dundalk, Co. Louth. 
Nar. sublinearis, (Donkin). Fresh water. 
Valve 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, N. H. Brit. Diat., p. 35. Pl. v., fig. 11 b. 
Killakee, Co. Dublin. 
Navicula eryptocephala, (Kiitz.) Fresh water. 
Valve small, narrow, elliptical, with produced slightly capitate 
ends. Striz fine, linear radiate; length ‘0012, breadth :0003. (Plate 
34, fig. 25.) 
Kutz. Bac. p. 95, 7, ai.; fig. 20, Wm./Sm:, B. D., Voli 1, prs3, 
