408 Proceedings of the Royal Irish Academj/. 



and figau'ed by Kiitzing under the name of Xavicula acuta, tlie de- 

 tails of wliich. are so 'indistinct that identification wonld he impossible, 

 but the outline of the yalye is such as to make it certain that it is 

 distinct from the present form. Kxitz. Bac, p. 93, T. iii., fig. 69. 



In a fossil state, it occurs abundantly in the Lough !Moume de- 

 posit. In a living state, I hare found it in the f olloTving localities : 

 River Erne, near Crossdoney, Co. Cavan. Lower Lake, Killarney, 

 €aumlough near Tralee, Co. Kerry. Eiver Dodder, Pond in Eotanie 

 Oardens of Tiinity College, Co. Dublin. Ealeool, Co. "\\^icklow. 



Na/oicida acutiuscuJa, (Gregory). Marine. 



Yalve narrow, lanceolate, with acute ends. Striae costate, slightly 

 radiate throughout; length -0040, breadth -0005. 



Ealfs, in Pritch., p. 906. — Pinnularia acutiuscula, G-regory, Q. J. 

 M. S. 1856, Trans., p. 48, PL v., fig. 21. Ptab. PL Eui\ Alg.,"sect. i., 

 p. 218. 



Stomachs of Ascidians, seaeoast, Co. Clare. 



Naxicida persgrina, (Ehr.) llarine or brackish water. 



Yalves broadly lanceolate, ends obtuse. Strise costate, sub-distant, 

 radiate; length -6046, breadth -0010. (Plate 34, fig. 6.) 



Kiitz. Bac, p. 97, T. xxviii., fig. 52. The form was considered 

 by Kiitzing to be identical with Pinnularia peregrina of Ehi-enberg. 

 Pialfs, in Pritch., p. 906. Cleve, Om Svenska bch Xorska Diat., 

 p. 225, Gmnow, Yerhand. der K. K. Zool. Bot. Gesell., Band x., 

 1860, p. 523. — Pinnularia peresiina, Y'm. Sm., B. D., Yol. i., p. 56, 

 PL xTiii., fig. 170. Eab. Fl. Eur. Alg., sect, i., p. 213. 



Salt ditch near the Town of Wexford, Eiver Slaney, near Ellurin, 

 Tacumshane, Co. "VTexford. Bellarena, mouth of the Eiver Eoe, Co. 

 Derry. Eostrevor, Co. Down. Breaches near Is^ewcastle," Co. 

 Wicklow. Kilkee, Co. Clare. Lough Gill, Co. KeiTy. Howth, Co. 

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

 small variety of this species occurred from stomachs of Ascidians 

 Belfast Lough, Co. Antrim. 



Navimla %ostereU, (Gmnow). Marine. 



Yalve, large lanceolate with sharp ends. Strife strongly costate, 

 siib-distant, radiate ; lengih -0056, breadth -0002. (Plate 34, fig. 7.) 



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

 p. 528, T. iv., fig. 23. The locality in which this form was found by 

 Grunow was the Adriatic Sea, fi-om a depth of fi'om two to four 

 fathoms. I know of no other locality in which the species has been 

 discovered save that specified below. — Pinnularia zostereti, Eab. EL 

 Eur. Alg., sect, i., p. 218. 



Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 



