O’Mrara—Report on the Irish Diatomacee. 283 
Fragilaria maxima, N. 8. Fresh water. 
Frustules very large; on side view, considerably expanded in the 
middle, and gradually tapering towards the rounded ends; strie fine, 
persistent. (Pl. 27, fig. 16.) 
Aghold, Co. Wicklow. 
Fragilaria crotonensis, (Kitton.) Fresh water. 
Frustules long ; margins on front view slightly waved ; on the side 
view narrow ; very slightly expanded in the middle, and gently attenu- 
ated towards the slightly capitate ends; striz fine, persistent. 
This species seems widely diffused, having been found by me in 
Slate made by Mr. Mozeley, of H.M.S. Challenger, at Kerguelin’s 
and. 
Pond, Newcastle Lyons, Co. Dublin. Miull-pond, Greenane, near 
Rathdrum, Co. Wicklow. Lough Derg, Co. Galway. Bundoran, Co. 
Donegal. 
Fragilaria tenuicollis, (Heib.) Fresh water. 
Frustules small ; on front view slightly attenuated at the ends; on 
side view narrow, considerably expanded in the middle, and gently 
attenuated towards the capitate, rounded ends; strie fine, persistent. 
Heiberg, De Danske Diat., p. 62, T. v., fig. 13. 
Mill-pond, Greenane, near Rathdrum, Co. Wicklow. Malahide, Co. 
Dublin. 
Kragilarva striatula, (Lyngb.) Marine. 
Frustules short; on side view linear, rounded at the ends; stric 
extremely fine, persistent. 
Lyngbye, Tent. Hydr. Dan., p. 183, T. 1xiii. Wm. Sm., B. D., Vol.ii., 
p. 23. Cleve, Om Svenska och Norska Diat., p. 219.—Fragilaria aurea, 
Grey. Brit. Flora, p. 403. Harvey’s Manual, p. 197.—Grammonema 
jurgensil, Agardh, Consp., p. 63. Ralfs, in Pritch., p. 778, Pl. xv., 
figs. 24,25. Rab., Fl. Eur., sect. 1, p.124.—Grammatonema stratulum, 
Kiitz. Sp. Alg., p. 187. 
Salt ditch, Arklow, Co. Wicklow. Ballybrack, Monkstown, 
Kingstown, Co. Dublin. Larne, Rathlin Island, Co. Antrim. 
Fragilaria construens, (Ehr.) Fresh water. 
Frustules short; on side view greatly expanded; ends short and 
attenuated ; striz fine, persistent. 
Grunow, Verhand der K. K. Zool. Bot. Gesel., Band xii., 1862, 
p. 871. Rab., Fl. Eur., sect. 1, p. 120.—Staurosira construens, Ehr. 
Mac., T.-ii. 3): fig. 8.5 T. ii 1, figs 15; T. xxxix. 2, fig. 10. Ralfs, 
in Pritch., p. 791. Pl. xv., fig. 5—Odontidium tabellaria, Wm. Sm., 
R.I. A. PROC., SER. II., VOL. II., SCIENCE. J 2N 
