310 Proceedings of the Royal Irish Academy. 
Synedra salina, (Wm. Sm.) Marine. 
Valve lanceolate, gradually attenuated towards the ends, which are 
rounded off, and broader than in Synedra splendens. (PI. 28, fig. 32.) 
Win. Sm. (BDF Wok. 1:,°%p.271 RE a, tie ses alte. inl Eee, 
p. 787. Grunow, Verhand. der K. K. Zool. Bot. Gesel. Band xu. 
p. 398.—Synedra ulna, var. marina Rab. Fl. Eur., sect. 1, p. 184. 
Tacumshane, Co. Wexford. Malahide, Clontarf, Co. Dublin. Ros- 
trevor, Co.Down. Stomachs of Ascidians, Roundstone Bay, Co. Galway. 
Synedra gallionii, (Ehr.) Marine. 
Frustules on front view slightly attenuated at the ends, on side 
view shorter, broader, and more obtuse at ends than in case of Synedra 
salina. (Pl. 28, fig. 33.) 
Kutz. Bac.,.p...68, I. xxx pie. 422 Wms smns B.D ay ol imap. 
74, Supp. Pl. xxx., fig. 265, who describes a shorter and stouter 
var.°10., Supp. Pl. xxx., fig. 265. B..  Ralis,..in .Prteh,.p:908s8, met. 
xu., figs. 34-36. Grunow, Verhand der K. K., Zool. Bot. Gesel., 
Band xii., 1862, p. 401. Rab. Fl. Eur., sect. 1, p. 137, who attributes 
the species to Bory. 
On seaweeds, Bannow, and Tacumshane, Co. Wexford. On sea- 
weeds, Malahide, Co. Dublin. Seaweeds, Larne, Co. Antrim. Sea- 
weeds, Dundrum Bay, Co. Down. Arran Islands, Co. Galway, and 
from seaweeds at different parts of the coast in the Co. Clare. 
The smaller variety has been found at Malahide, Howth, Co. 
Dublin. On seaweeds, Larne, Co. Antrim, and in the other localities 
where the larger species has occurred. 
Synedra spathulata, N.S. Fresh water. 
Frustules very large; length, -0130; on front view wider at ends 
than middle; greatest breadth, ‘0012; ends straight; on side view 
wider in the middle, and gradually attenuated towards the ends, at 
some distance from which ‘0028, bending inwards and then outwards, 
then suddenly constricted towards the broadly capitate rounded extre- 
mities. Striz course, costate. (Pl. 28, fig. 34.) 
Ditch at bank of Royal Canal, near Kileock, Co. Kildare. An un- 
dulate variety of the species occurs in a well, Newcastle, Lyons, Co. 
Dublin. 
Synedra barbatula, (Kiitz.) Marine. | 
Frustules short, on front view quadrangular; on side view broadly 
elliptical; strie fine, but distinct. (Pl. 28, fig. 35.) 
Kiitz. Bac., p. 68, T.-xv., fig. 104. , Ralfs;an Pritch,, p. 789.—— 
Synedra gracilis, var. barbatula, Grunow, Verhand. der K.K. Zool. Bot., 
Gesel., Band xii., p. 402. 
Salthill, Co. Dublin. Stomachs of Ascidians, Roundstone Bay, 
Co. Galway. Seaweeds, Tramore, Co. Waterford. 
