0'Meae.a — Report on the Irish Biatomacece. 299 



Synedra superla, (Xiitz.) Marine. 



Fmstules long on front view, quadrangnlar, sligMly tapering at 

 the ends ; on side yiew tapering slightly from the middle to the 

 broadly rounded ends ; submarginal longitudinal lines strongly deve- 

 loped ; striae linear, coarse, and slightly "waved ; stipes short. (PL 

 28, fig. 9.) 



Kiitz. Bac, p. 69, T. xv., fig. 13. Wm. Sm., B.D., Yol. i., p. 

 74, PI. xii., fig. 102. Ealfs, in Pritch., p. 789. Gmnow, Yerhand. 

 der K. K. Zool. Bot. Gesel., Band xii. p. 406. Balfs, in Pritch., p. 

 789. Cleve, Om Svenska och JSTorska Diat., p. 220. Eab. Fl. 

 Eur., sect. 1, p. 139. 



Prom 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. 



Syyiedra amphicephala, (Kiitz.) Presh water. 



Prustule 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; striae very fine, (PI. 28, fig. 10.) 



Grunow places this species in association with those in which the 

 strise are interrupted in the middle by a longitudinal sulcus, but in 

 the specimens which have come - under my notice the striae are obvi- 

 ously pervious. 



Kiitz. Bac, p. 64, T. iii., fig. 12. Eab. Siissw. Diat., p. 53, T. 

 iv., fig. 28. Ealfs, in Pritch., p. 787. Grunow, Yerhand. der K. K. 

 Zool. Bot. Gesel., Band xii., 1862, p. 400, T. v., fig. 11. Eab. PI. 

 Eur., sect. 1, p. 136. 



Peighcullen, Co. Kildare. Xilcool, Powerscoui't, Co. "Wicklow. 

 Bantry, Well at Parraghy, Co. Cork. Tarbert, Co. Kerry, 



Synedra investiens, (Wm. Sm.) Marine. 



Prustules minute, length varying from -0005 to 0020 ; on front 

 view quadrangular, on side view narrow, linear, tapering towards the 

 rounded extremities; striae coarse and very close. (PI. 28, fig. 11.) 



AYm. Sm., B.D., Yol. ii., p. 98. Ealfs, in Pritch, p. 787. Eab. 

 Fl. Em-., sect. 1, p. 135. The last named author places this species in 

 a group distinguished by the fact of the striae being interrupted by a 

 median free space ; but in a slide kindly supplied to me by Major 

 Crozier, E. E., and described as part of the original gathering of Smith's 

 Synopsis, the forms answering Smith's description have strong pervious 

 costae. 



Malahide. Kingstown Harbour. Salthill, Co. '^Dublin. 



K. I. A. PROC, SEE. n., VOL. II., SCIENCE. 2 



