O’Mrara—Report on the Irish Diatomacee. 269 
I have had considerable difficulty in identifying this species; in 
some respects it agrees with the description of Eupodiscus sparsus, 
Greg., Q.J.M.S., 1856, p. 81, Pl.1., fig. 47. But as it more nearly 
resembles specimens frequently to be met with in the Richmond 
deposit, which Ralfs seems to have had in view when he named the 
species, I have adopted his specific designation. 
Ralfs, in Pritch., p. 834. 
Salt ditch near Wexford. Sea-weeds, Ballybrack, Co. Dublin. 
Actinocyclus crassus, (Wm. Sm.) Marine. 
Strie moniliform; principal rays strongly marked when viewed by 
a low power; arrangement of puncta somewhat confused; border 
narrow, punctate, puncta decussate; submarginal nodule small; dia- 
meter °0020. 
BRalfs, in Pritch., p. 835.—Eupodiscus crassus, Wm. Sm., B.D., 
Vola. p.24, Pl. iv. fig: 41. 
Sea-weeds, Ballybrack. Stomachs of Pectens, Dalkey Sound, 
Malahide, Howth, Co. Dublin. Stomachs of Ascidians, Co. Clare. 
Actinocyclus fulvus, (Wm. Sm.) Marine. 
Strie moniliform, close, subradiate; border broad; striation indis- 
tinct; submarginal nodule small. Diameter about -0025. 
Ralfs, in Pritch., p. 835.—Eupodiscus fulvus, Wm. Sm., B.D., 
Vol. i., p. 24, Pl: iv., fig. 40. 
Stomachs of Pectens, Dalkey Sound, Co. Dublin. Stomachs of 
Ascidians, Roundstone Bay, Co Galway. 
Genus XII. Evpoprscus, Ehr. 
Valves having horn-like processes springing from the surface. 
Eupodiscus argus, (Ehr.) Marine. 
Disk large, areolate; areoles irregular, somewhat angular, radiately 
disposed ; processes three or four, submarginal. Diameter from -0065 
to 0120. (Pl. 27, fig. 3.) 
Wu, 5m. “DB... Vol. i, p..24, El: tv. tie. 39. ° Ralfs, m Priteh.. 
p- 8438, Pls. vi., fig: 2, and xi:, figs: 41, 42: Heiberg, De Danske 
Diat., p: 387: Rab. Fl. Eur., sect. i., p. 319.—Tripodiscus argus, 
Kutz. Bac. p. 136; 7.2; fic. 6, 
Dublin Bay. 
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