O’Mrara—Report on the Irish Diatomacee. 377 
fine, but easily detected, parallel; longitudinal striz generally obscure; 
intermediate free space narrow, except in the middle, where it expands 
into a quadrangular area; length about *0008, breadth about -0008. 
(Plate 31, fig. 55.) 
Grunow, Verhand. der K. K. Zool. Bot. Gesell, Band x., 1860, 
T. iv., fig. 4. Grunow, with a note of doubtfulness, refers the species 
to Naegeli. Schumann, Die Diat. der Hohen Tatra, p. 70. Rab. FI. 
Kur. Alg., sect. 1, p. 185. 
Lough Derg, Co. Galway. Killakee, Co. Dublin. Ditch near 
town of Galway. 
Navicula incurva, (Greg.) Fresh water. 
Valve slightly incurved in the middle ; ends broadly produced, sub- 
capitate ; longitudinal sulci parallel, with median line distinct; strie 
obscure; length about 0020, breadth -0005. (Plate 31, fig. 56.) 
Gresory, GQ!) Mos. 1856; p.'8) Pl 1., fig. ‘26. Ralis,in Pritch., 
Poseos hab. ie ur. Als. seet.1., p. 200... Donkin, N. H. Brit. 
Diat., p. 38, Pl. vi., fig. 2. 
Portmarnock, Co. Dublin. Callows, near Ballinasloe, Co. Galway. 
(¢) Monilifere. 
Valves more or less lanceolate; strie@ obviously moniliform, not reach- 
ing the median line; free intermediate space narrow. except in the middle, 
where tt 1s generally more or less expanded. 
Navicula punctulata, (Wm. Smith.) Brackish or marine. 
Valve broadly elliptical, with shghtly apiculate ends; intermediate 
free space narrow, slightly expanded in the middle; striz close, radiate ; 
length about :0026, breadth -0012. (Plate 382, fig. 1.) 
Wm. Sm., B.D., vol.i., p. 52, Pl. xvi., fig. 151. Grunow, Verhand. 
der K. K. Zool. Bot. Gesell., Band x., 1860, p. 5837.—Navicula marina, 
Ralfs, in Pritch., p.9038.. Rab. Fl. Eur. Alg., sect.i., p. 202. Donkin, 
N. H. Brit. Diat., p. 19, Pl. in., fig. 5. The last named author 
remarks, ‘‘ Although this species is described as marine in the Synop- 
sis of Prof. Smith, I have never found it in purely marine localities, 
where its congener N. granulata is found.” Some of the undernamed 
localities in which I have found the species are decidedly marine. 
Stomachs of Ascidians, Belfast Lough, Co. Antrim. Seaweeds, 
Bannow, Co. Wexford. Portmarnock, Co. Dublin. Rostrevor, Co. 
Down. Seaweeds, Kilkee, Co. Clare. Laytown, Co. Meath. Dre- 
hednamaud, near Castlegregory, Co. Kerry. 
Navicula granulata, (De Brébisson). Marine. 
Valve broadly elliptical, with slightly produced broad rounded 
ends; intermediate free space narrow, linear, except at the cen- 
