316 Proceedings of the Royal Irish Academy. 



p. 42, PI. xlii.,fig. 314. Ealfs, in Pritcli., p. 808, PL iv., fig. 47, 

 PI. xi., fig. 52 and 53. Grunow, Yerhand. der K. K. Zool. Bot. Gesel., 

 Band, xii., 1862, p. 415. Heiberg, De Danske Diat., p. 71. Eab. PL 

 Eur., s. 1, p. 303. Cleve, Om Srenska ocli ISTorska Diat., p. 222. 



Sea-weeds, ]\Ialaliide. Sea-'weeds, Portmarnock, Co. Dublin. Sea- 

 ' weeds, Portnish ; and same, Co. Antrim. Arran Islands, Co. Galway. 

 Tacnmsbane, Co. Wexford. 



Grammatophora macilenta, ("Wm. Sm.) Marine. 



Prnstnles on front view quadrangular, but sometimes slightly 

 arcuate ; generally much longer than tbe preceding species ; on side 

 view nearly linear ; diapkragms similar to the last, except tbat the 

 foramen is more elliptical, and the strise finer. 



Wm. Sm., B. D., Vol. ii., p. 43. Supp. PL Ixi., fig. 382. Ealfs, 

 inPritch., p. 808. Eab. El, Eur., sect. l,p. 304. Cleve, Om Svenska 

 ocb Norska Diat., p. 222. — Grammatopbora oceanica, var. macilenta, 

 Grunow, Yerhand. der K. K. Zool. Bot. Gesel., Band xii., 1862, 

 p. 417. 



Salt ditch, near "Wexford. Tacumshane, Co. Wexford. Carnlough 

 Bay, Portrush. Waterfoot, Co. Antrim. Dundrum Bay, Co. Down. 

 Arran Islands, Co. Galway. 



GrammatopTiora serpentina, (Ealfs.) Marine. 



Prustules on fi'ont view regularly quadi-angular ; on side view 

 linear elliptic ; strise obvious ; diaphi-agms undulate, and seen on front 

 view spii-al. (PL 29, fig. 2.) 



Kiitz. Bac, p. 129, T. xxix., fig. 82. Wm. Sm., B. D., YoL ii., 

 p. 43, PL xlii., fig. 315. Ealfs, in Pritch., p. 808, PL iv., fig. 48. 

 Grunow, Yerhand. der K. K. Zool. Bot. Gesel., Band xii., 1862, p. 420. 

 Eab. EL Eur., sect. 1, p. 304, Cleve, Om Svenska ocli jN'orska Diat., 

 p. 222. — Striatella serpentina, Ealfs. An. JSTat. Hist., YoL ii., PL is., 

 fig. 5. 



Malahide, Co. Dublin. Sea- weeds near town of Wicklow. Tacum- 

 shane, Co. Wexford. Portrush, Co. Antrim. Arran Islands, Co. 

 Galway. • 



Grammatopliora haJfouriana, (Y'm. Sm.) Eresh water. 



Erustules small ; on front view quadi'angular ; on side view linear, 

 elliptical ; diaphragms direct, without curvature ; striae fine. 



Ealfs, following Greville, establishes a new genus Diatomella to 

 receive this single form, and is followed in this view by Grunow and 

 Eabenhorst ; but, as it appears to me, the characters are not such as to 

 distinguish the new genus from Grammatopbora. 



Wm. Sm., B. D., YoL ii., p. 43, Supp. PL Ixi., fig. 383. Ealfs, in 



