O’Mrara—Report on the Irish Diatomacee. od61 
Gesell., Band x., 1860, p. 540, T. iv., fig. 84. Cleve, Om Svenska och 
Norska Diat., p. 227. Donkin, N. H. Brit. Diat., p. 34, Pl. v., 
fig. 10. 
Tacumshane, Co. Wexford. Lough Gill, Co. Kerry. Moist rock, 
Portrush, Co. Antrim. River Bann, near Coleraine, Co. London- 
derry. 
Navicula quarnerensis, (Grunow). Marine. 
Valve broadly elliptical, slightly produced towards the apiculate 
ends; striz fine, obscurely punctate, radiate; length :0028, breadth. 
0012. (Plate 31, fig. 12.) 
Grunow, Verhand. der K. K. Zool. Bot. Gesell., Band x., 1860, p. 
530, T. in., fig. 8, found in the Adriatic Sea, from two to four fathoms 
in depth. 
Salt ditch, near Galway town. Stomachs of Ascidians, Roundstone 
Bay, Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Navicula Davidsoniana, N.S. Marine. 
Valve broadly elliptical; ends slightly produced, apiculate; strice 
fine, linear, parallel in the middle, and slightly radiate towards the 
ends; central nodule large, elongate, longitudinal ; sulci very distinct, 
slightly expanded in the middle. (Plate 31, fig. 13.) 
From stomachs of Ascidians, Co. Clare. 
Navicula ovulum, (Grunow). Marine. 
Valve broadly elliptical; strice fine, linear, slightly radiate in the 
middle, and more so towards the ends; longitudinal sulci strongly 
marked, and quite parallel through their entire length; central nodule 
small; colour of dry frustule pale yellow; length -0024, breadth 
“0011. (Plate 31, fig. 14.) 
Grunow, Verhand. der K. K. Zool. Bot. Gesell., Band x., 1860, 
p- 519, T. iii., fig. 19.—Navyicula litoralis, Donkin, N. H. Brit. Diat., 
pes; Bisiyiige 2. 
Malahide. 
(d.) Latiuscule. 
Valves generally elliptical; ends sometimes produced; striae fine ; 
intermediate free space generally broad, and expanded in the middle; a 
submarginal longitudinal sulcus more or less distinctly developed. 
Nawicula latiuscula, (Kutz.) Fresh water. 
Valve broadly elliptical; striz delicate, parallel; length about 
“0048, breadth -0014; intermediate free space much expanded. 
(Plate 31, fig. 15.) 
Kitz. Bac., p. 93, T. v., fig. 40. This form could scarcely have 
