O'Meara — Report on the Irish Diatomacece. 361 



•Oesell., Band x., 1860, p. 540, T. iv., fig. 34. Cleve, Om Svenska ocli 

 K'orska Diat., p. 227. Donkin, E". H. Erit. Diat., p. 34, PI. v., 

 fig". 10. 



TacTimsliaiie, Co. "Wexford. Loiagli Gill, Co. Kerry. Jloist rock, 

 Portrush, Co. Antrim. River Bann, near Coleraine, Co. London- 

 derry. 



Navicula quarnerensis, (Grrnnow). Maiine. 



Valve broadly elliptical, slightly produced towards the apicnlate 

 ends;. striae fine, obscurely punctate, radiate; length. -0028, breadth 

 •0012. (Plate 31, fig. 12.) 



Grunow, Yerhand. der K. K. Zool. Bot. Gesell., Band x., 1860, p. 

 530, T. iii., fig. 8, found in the Adriatic Sea, from two to four fathoms 

 in depth. 



Salt ditch, near Galway town. Stomachs of Ascidians, Boundstone 

 Bay, Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 



Navicula JDavidsojiiana, 1^. S. Marine. 



Yalve broadly elliptical ; ends slightly produced, apieulate ; strife 

 fine, linear, parallel in the middle, and slightly radiate towards the 

 ■ends ; central nodule large, elongate, longitudinal ; sulci very distinct, 

 slightly expanded in the middle. (Plate 31, fig. 13.) 



Prom stomachs of Ascidians, Co. Clare. 



Xavicida ovulum, (Grunow). Marine. 



Yalve broadly elliptical ; striae fine, linear, slightly radiate in the 

 middle, and more so towards the ends ; longitudinal sulci strongly 

 marked, and quite parallel through their entire length; central nodule 

 small; colour of dry frustxde pale yellow; length -0024, breadth 

 -0011. (Plate 31, fig. 14.) 



Grunow, Yerhand. der K. K. Zool. Bot. Gesell., Band x., 1860, 

 p. 519, T. iii., fio-. 19.— Is^avicula litoralis, Donkin, 2^. H. Brit. Diat., 

 p. 5, PI. i., fig. 2, 



llalahide. 



(d.) Latiusculce. 



Valves generally elliptical; etids sometimes produced ; strice fine ; 

 intermediate free space generally Iroad, and expanded in the middle ; a 

 submarginal longitudinal sulcus more or less distinctly developed. 



Navicula latiuscula, (Kiitz.) Presh water. 



Yalve broadly elliptical ; striiB delicate, parallel ; length about 

 •0048, breadth '0014; intermediate free space much expanded. 

 (Plate 31, fig. 15.) 



Kiitz. Bac, p. 93, T. v., fig. 40. This form could scarcely have 



