316 _ Proceedings of the Royal Irish Academy. 
p:.42, Pl. xii., fig. 314. Ralis, im Pritch., p. 808, Pl. iv., fig. 47, 
Pl. xi., fig. 52 and 53. Grunow, Verhand. der K. K. Zool. Bot. Gesel., 
Band. xii., 1862, p. 415. Heiberg, De Danske Diat., p. 71. Rab. Fl. 
Eur., s. 1, p. 308. Cleve, Om Svenska och Norska Diat., p. 222. 
Sea-weeds, Malahide. Sea-weeds, Portmarnock, Co. Dublin. Sea- 
weeds, Portrush; and same, Co. Antrim. Arran Islands, Co. Galway. 
Tacumshane, Co. Wexford. 
Grammatophora macilenta, (Wm. Sm.) Marine. 
Frustules on front view quadrangular, but sometimes slightly 
arcuate ; generally much longer than the preceding species; on side 
view nearly linear; diaphragms similar to the last, except that the 
foramen is more elliptical, and the strie finer. 
Wm. Sm., B. D., Vol. u., p. 43. Supp. Pl. Ix.., fig, 382. Ralfs, 
in Pritch., p. 808. Rab. El, Eur., sect. 1, p. 304. Cleve, Om Svenska 
och Norska Diat., p. 222.—Grammatophora oceanica, var. macilenta, 
Grunow, Verhand. der K. K. Zool. Bot. Gesel., Band xii., 1862, 
p.4aLi. 
Salt ditch, near Wexford. Tacumshane, Co. Wexford. Carnlough 
Bay, Portrush. Waterfoot, Co. Antrim. Dundrum Bay, Co. Down. 
Arran Islands, Co. Galway. 
Grammatophora serpentina, (Ralfs.) Marine. 
Frustules on front view regularly quadrangular; on side view 
linear elliptic; strize obvious; diaphragms undulate, and seen on front 
view spiral. (Pl. 29, fig. 2.) 
Kutz: Bac., p:-129, T. xxix. -fig.-827> Wm. Sms B,D Volvos 
p. 48, Pl. xlii., fig. 315. Ralis, in Pritch., p. 808, Pl. iv., fig. 48. 
Grunow, Verhand. der K. K. Zool. Bot. Gesel., Band xii., 1862, p. 420. 
Rab. Fl. Eur., sect. 1, p. 304. Cleve, Om Svenska och Norska Diat., 
p. 222.—Striatella serpentina, Ralfs. An. Nat. Hist., Vol. ii., Pl. ix., 
fig. 5. 
Malahide, Co. Dublin. Sea-weeds near town of Wicklow. Tacum- 
shane, Co. Wexford. Portrush, Co. Antrim. Arran Islands, Co. 
Galway. 
Grammatophora balfourvana, (Wm. Sm.) Fresh water. 
Frustules small; on front view quadrangular; on side view linear, 
elliptical ; diaphragms direct, without curvature; strie fine. 
Ralfs, following Greville, establishes a new genus Diatomella to 
receive this single form, and is followed in this view by Grunow and 
Rabenhorst ; but, as it appears to me, the characters are not such as to 
distinguish the new genus from Grammatophora. 
Wm. Sm., B. D., Vol. u., p. 43, Supp: Pl. 1x1., fig. 383. Ralfs, i in 
