360 Proceedings of the Royal Irish Academy. 



and tlie only three localities in which. I hare found it in Ireland, if 

 not marine, are certainly brackish. 



Kiitz. Bac, p. 94, T. iii., fig. 55, who attributes the species to 

 Ehrenberg. Ealfs, in Pritch., p. 901, who regards it as distinct from 

 IS'ayicula sculpta, Ehr. Grunow, Yerhand. der K. K. Zool. Bot. 

 Gesell., Band X., 1860, p. 540, who states that he did not find the 

 form in the Santa Fiore Bergmehl. examined by him, but confirms 

 Donkin's statement of having obtained it in the Eranzensbad deposit. 

 Dohkin, I^. H. Brit., Diat., p. 15, PI. ii., fig. 9. Eab. El. Eur. Alg., 

 sect, i., p. 197. 



Seashore, Queenstown, Co. Cork. Breaches, Co. "Wicklow. Salt 

 HiU, Co. Dublin. 



Nmicula tenuirostris, !N". S. Marine. 

 _ Yalye elliptical, with long produced narrow apices; length '0018, 

 hreadth -0006 ; strise fine, parallel in the middle, and slightly radiate 

 towards the ends ; less distinct midway between the margin and the 

 longitudinal sulcu.s ; intermediate free space narrow, apparently ex- 

 panding in the middle in a short and very narrow staui'oform band. 

 (Plate 31, fig. 9.) 



Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 



JSfavicula ambigua, (Ehr.) Eresh water. 



Yalves elliptical, ends produced and capitate ; length "0032, 

 breadth -0010 ; strijB fine, parallel. (Plate 31, fig. 10.) 



Kiitz. Bac, p. 95, T. xxviii., fig. 66, who attributes the species to 

 Ehrenberg. Wm. Sm., B. D., YoL i., p. 51, PI. xyi., fig. 149. Sab. 

 Siissw. Diat., p. 40, T. vi., fig. 59. Ptalfs, in Pritch., p. 902. Gru- 

 now, Yerhand, der K. K. Zool. Bot. Gesell., Band x., 1860, p. 529, T. 

 iv., fig. 33. Cleve, Om Srenska och l^orska Diat., p. 228. Donkin, 

 1^. H., Brit. Diat., p. 39, PL vi., fig. 5. 



Biver Erne, near Crossdoney, Co. Cavan. Pool near Glencar, Co. 

 Cork. Eiver Bann, near Coleraine, Co. Londonderry. 



Namcula splimro'pliora, (Kiitz.) Eresh water. 



Yalve elliptical ; ends considerably produced and capitate ; striae 

 fine, punctate, slightly convergent; length -0030, breadth "0010. 

 (Plate 31, fig. 11.) 



Efitz. Bac, p. 95, T. iv., fig. 17. Wm. Sm., B. D., Yol. i., p. 52, 

 PL xvii., fig. 148, who represents the striae as moniliform, an appear- 

 ance they present only when not in focus. Eab. Siissw. Diat., p. 40, 

 T. vi., fig. 65a, 65b being, as it would appear, a very distinct fonn, 

 EaKs, in Pritch., p. 899. Grimow, Yerhand. der K. K. Zool. Bot. 



