O’Meara—Report on the Irish Diatomacee. 299 
Synedra superba, (Kiitz.) Marine. 
Frustules long on front view, quadrangular, slightly tapering at 
the ends; on side view tapering slightly from the middle to the 
broadly rounded ends; submarginal longitudinal lines strongly deve- 
loped; striz linear, coarse, and slightly waved; stipes short. (Pl. 
28, fig. 9.) 
Marz ec... 1.69, To xm, ne. tae Wm. Sm. B.D... Vol: ‘2, p. 
74, Pl. xu., fig. 102. Ralfs, in Pritch., p. 789. Grunow, Verhand. 
der K. K. Zool. Bot. Gesel., Band xii. p. 406. Ralfs, in Pritch., p. 
789. Cleve, Om Svenska och Norska Diat., p. 220. Rab. FI. 
Kur., sect. 1, p. 189. 
From stomachs of Ascidians, as well as from seaweeds, Belfast 
Lough, Co. Antrim. Seaweeds, Rostrevor, Co. Down. Seaweeds, 
near Wexford. Seaweeds, Malahide, Co. Dublin. Arran Islands, 
Stomachs of Ascidians, Roundstone Bay, Co. Galway. 
Synedra amphicephala, (Kiitz.) Fresh water. 
Frustule small and narrow, length ‘0018, breadth in middle, on 
side view ‘00015. On front view linear; on side view nearly linear 
in the middle, and gradually attenuated towards the slightly dilated 
apices; strie very fine. (Pl. 28, fig. 10.) 
Grunow places this species in association with those in which the 
striz are interrupted in the middle by a longitudinal sulcus, but in 
the specimens which have come under my notice the strie are obyi- 
ously pervious. 
Kitz. Bac., p. 64, T. i., fig. 12. Rab. Siissw. Diat., p. 53, T. 
iv., fig. 28. Ralfs, in Pritch., p. 787. Grunow, Verhand. der K. K. 
Zool. Bot. Gesel., Band xi., 1862, p. 400, T. v., fig. 11. Rab. FI. 
Eur., sect. 1, p. 136. 
Feighcullen, Co. Kildare. Kailcool, Powerscourt, Co. Wicklow. 
Bantry, Well at Farraghy, Co. Cork. Tarbert, Co. Kerry. 
Synedra investiens, (Wm. Sm.) Marine. 
Frustules minute, length varying from ‘0005 to 0020; on front 
view quadrangular, on side view narrow, linear, tapering towards the 
rounded extremities; strie coarse and very close. CPS 28, fe. 1b.) 
Wm. Sm., B.D., Vol. u., p. 98.  Ralfs, im Pritch, p. 787. Rab. 
Fl. Eur., sect. 1, p. 185. The last named author places this species in 
a group distinguished by the fact of the strie being interrupted by a 
median free space; but in a slide kindly supplied to me by Major 
Crozier, R. E., and described as part of the original gathering of Smith’s 
Synopsis, the forms answering Smith’s description have strong pervious 
cost. 
Malahide. Kingstown Harbour. Salthill, Co. Dublin. 
R.I. A. PROC., SER. II., VOL. II., SCIENCE. 20 
