O’Mrara—Report on the Irish Diatomacew. 545 
which latter he refers to as Navicula lata, p. 908. Grunow, Verhand. 
der K. K. Zool. Bot. Gesel., Band x., 1860, p. 515.—Pinnularia 
pachyptera, Rab. Siissw. Diat., p. 44, T. vi., fig. 11.—Pinnularia 
IoteoWm.esn., » BD; Vols ign 55; Pl. xviu., fig:, 167. .Kitzing 
describes a form as Nayicula lata, Bac., p. 92, T. i., fig. 51, which is 
obviously different from the present. 
Pool, Glencree, Co. Wicklow. River Dodder, Featherbed Moun- 
tain, Co. Dublin. River Bann, near Hilltown, Co. Down. 
Navicula distans, (Wm. Sm.) Marine. 
Frustule on front view slightly constricted in the middle, and 
gently attenuated at the ends; valve lanceolate, length about ‘0043, 
breadth about :0010; coste not so robust as in the preceding; conver- 
gent; intermediate free space lanceolate, much expanded in the 
middle and narrow towards the ends. (Plate 30, fig. 6.) 
Grunow, Verhand. der‘K. K. Zool. Bot. Gesel., Band x., 1860, p. 523. 
Ralfs, in Pritch., p. 907. Cleve, Om Svenska och Norska Diat., p. 224, 
—Pinnularia distans, Wm. 8m., B. D., Vol. 1. p. 56, Pl. xviii., fig. 169. 
Rab. Fl. Eur. Alg., sect. 1, p. 214. 
Sea-weeds, Bannow, Co. Wexford. Sea-weeds, Malahide, Sto- 
machs of Pectens, Dalkey, Piles of wooden bridge, Dollymount 
Strand, Sea-weeds, Howth, Co. Dublin. Stomachs of Ascidians, 
Belfast Lough, Co. Antrim. Stomachs of Ascidians, Co. Clare. Sea- 
weeds, Kilkee, Co. Clare. 
Navicula undulata, N.S. Marine. 
Length of valve ‘0060, breadth, -0015; lanceolate with rounded 
ends; median line undulate, intermediate free space lanceolate, greatly 
expanded in the middle; costz strong, convergent. (PI. 30, fig. 7.) 
Sea-weeds, Giants’ Causway, Co. Antrim. 
Navicula rectangulata, (Gregory.) Marine. 
Valve linear; length about -0040, breadth about -0010; slightly 
expanded at the middle and ends, which latter are rounded; inter- 
mediate free space narrow at ends, but roundly expanded in the 
middle; coste strong, converging in the middle, and radiate towards 
the ends; frustule on front view constricted in the middle. (Plate 
30, fig. 8.) 
Gregory, Diat. of Clyde, p. 479, Pl.ix., fig. 7. Donkin, N. H. 
Brit. Diat., p. 66, Pl. x., fig. 5—Pinnularia rectangulata, Rab. FI. 
Kur. Alg., sect. 1, p. 215. 
Stomachs of Ascidians, Broadhaven, Co. Galway. 
