O’Mrara—Report on the Irish Diatomacee. 341 
Navicula mayor, (Kiitz.) Fresh water. 
Valve about the same length as that of N. nobilis; oblong, but very 
sightly expanded in the middle, and at the rounded, somewhat conical, 
ends; longitudinal free space narrower than that of N. nobilis; coste 
broad, converging in the middle, and nearly parallel for the remainder. 
On front view frustule linear with rounded angles. 
Kiitz. Bac., p.97, T.iv., fig. 19. Ralfs, in Pritch., p. 896. Grunow, 
Verhand. der K. K. Zool. Bot. Gesel., Band x., 1860, p. 515. Heiberg, 
De Danske Diat., p. 80. Cleve, Om Svenska och Norska Diat., p. 
223.—Pinnularia major, W.Sm., B. D.,Vol.i., p. 54, Pl. xvii., fig. 161. 
Rab. Stissw. Diat., p. 42, T. vi., fig. 5. Do. Fl. Eur. Alg., sect. 1, 
p. 210. 
Lower Lake, Killarney, River near Glencar, Co. Kerry. River 
Bann, near Coleraine, Co. Derry. Marl pit, near Arklow, Streamlets 
on Carrickmacreilly Hill, Greenane, Co. Wicklow. Derrylane Lough, 
Co. Cavan. Killakee, Featherbed Mountain, Co. Dublin. Slieve 
Donard, Co. Down. Lough Mourne deposit. Dromore Sub-peat 
deposit. Lough Islandreayy deposit. Pond near Camolin, Co. Wex- 
ford. 
Navieula cardinalis, (Ehr.) Fresh water. 
Valve oblong-linear, length about °0125; breadth about ‘0022, 
rounded at the ends; median line undulate; end nodules large; free 
intermediate space wide, reaching the margin in the middle, forming a 
broad stauroform space; cost broad, converging in the middle, nearly 
parallel for the remainder. (PI. 30, fig. 2.) 
Ralfs, in Pritch., p. 806, Pl. xu., fig. 72. Grunow, Verhand. der K. K. 
Zool. Bot. Gesel., Band x., 1860, p. 515.—Pinnularia cardinalis, Ehr. 
Wm. §m., B.D., Vol. i., p. 55, Pl. xix., fig. 166. Rab. Fl. Eur. Alg., 
sect 1, p. 220.—Stauroneis cardinalis, Kiitz. Bac., p. 106, T. xxix., 
fig. 10. 
Lough Mourne deposit; found also living in a pond near the city 
of Armagh. 
Navicula viridis, (Nitzsch.) Fresh water. 
Valve varying much in size; linear elliptical, with rounded ends; 
intermediate free space narrower than in the three preceding species, 
and not so much expanded in the middle; costz broad, but not so much 
so as in the preceding. (PI. 30, fig. 3.) 
This species has been attributed to various authors, but if Kiitzing 
be right in supposing it to be = Bacillaria viridis, Nitzsch, 1817, it 
should be attributed to the last named author, as Heiberg has done. 
Smith assigns the species to himself, although regarding it us = Nayi- 
cula viridis, Ehr. Rabenhorst attributes it to himself, while Grunow 
attributes it to Kiitzing. Grunow makes this form the type of the 
group Virides, but seems to regard Navicula major, which he includes 
