410 Proceedings of the Royal Irish Academy. 
Navicula galvagensis, N. S. Marine. 
Valve oblong, elliptical, ends narrowed and rounded. Striz cos- 
tare, radiate; length -0024, breadth :0005. (Plate 34, fig. 12.) 
Salt marsh near town of Galway ; Stomachs of Ascidians, Broad- 
haven Bay, Co. Galway. 
Navicula solaris, (Gregory). Marine. 
Valve elliptical, with obtuse rounded ends. Striz fine, linear, 
convergent in the middle, and very distinct, radiate towards the ends 
and less distinct. (Plate 34, fig. 13.) 
Gregory, Q..J.. M.S. 1856, Trans, p-43, PE wv. ie, 10.5 flee 
figure represents the striz as shortened in the middle so as to leave a 
blank space round the central nodule. And such is the appearance 
presented by the specimens that haye come under my notice; but 
when well focused the blank space disappears, and the striz are found 
to reach the median line. Ralfs, in Pritch., p. 904. Rab. Fl. Eur. 
Alg., seet- 1., p. 181. 
Ballarena, Co. Derry. Adregoole, Co. Galway. Malahide, Co. 
Dublin. 
Navicula viridula, (Kitz.?) Fresh water. 
Valve elliptical, lanceolate, sometimes slightly produced. Strix 
fine, lmear, convergent in the middle, radiate towards the ends; 
length -0016, breadth :0005. (Plate 34, fig. 14.) 
Kutz., Bac. p: 91,778. xxx), Tie 47; cl iy ee, 1 Otand epee | 
only one of these figures which at all resembles the present form is 
the last. Ralfs, in Pritch., p. 905. Cleve, Om Svenska och Norska 
Diat., p. 225. Lagerstedt, Sotv. Diat. frin Spetsbergen och Beeren 
Kiland, p. 25.—Pinnularia viridula, Wm. 8m., B. D., Vol. i., p. 57, 
Pl. xviu., fig. 175. The description is accurate, but the figure 
represents the costz as greatly coarser than they are in reality. The 
effect is to make this species appear scarcely to differ from Pinnularia 
eracilis. Lagerstedt indeed remarks, ‘‘I have considered it right to 
unite under the above name (Navicula viridula) the two species of 
Smith, Pinnularia viridula, and Pinnularia gracilis,” p. 25. The 
strie, however, in the former, are extremely fine, whereas in the 
latter they are very coarse. Rab. Fl. Eur. Alg., sect. 1., p. 214. I 
think it not unlikely that this form is identical with that which 
Grunow has described as Navicula rhyncocephala, var. brevis. 
Verhand. der K. K. Zool. Bot. Gesell., Band x., 1860, p. 529, T. iv., 
fig. 3le. ; 
Camolin, Co. Wexford. Lough Gill, Co. Kerry. Kullakee, 
Stream near Clontarf, Co. Dublin .Ditch near town of Sligo. Well, 
Strokestown, Co. Roscommon. 
