386 Proceedings of the Royal Irish Academy. 



forms under the one designation jSTaTiciila elliptica. However close 

 tlie resemblance must be acknowledged to be, there is such a difference 

 in the details of structure as to requii'e notice. Ralfs, in Pritch., 

 p. 899, regards the form as identical with Xayicula elliptica, and the 

 same view is adopted by the following authors : Cleve, Om Svenska 

 och IS'orska Diat., p. 226. Eabenhorst, Fl. Eur. Alg., sect, i., p. 179. 

 Donkin, N. H. Brit. Diat. Lagerstedt, Sotvat. Diat. fran Spetsbergen 

 och Beeren Eiland, p. 27, and probably Grrunow, Yerhand. der K. K. 

 Zool. Bot. GeselL, Bandx., 1860, p. 531. Castracane includes the two 

 forms under the designation of Navicula ovalis ; Catalog© di Diat. rac- 

 colte nella Val. Intrasca, p. 12. Schmidt, treating the two forms 

 as distinct species, describes the present as JS'avicula ovalis ; Atlas der 

 Diat. T. vii., figs. 34 and 35. 



Camolin, Co. AYexford. Lough Xeagh, near Lurgan, Co. Ai-magh. 

 Lough Gill, Co. Kerry. Lough Mourns deposit. 



Var. parva, (O'jieara). Eresh water. 



Yalve like the last variety, but very much smaller, and the stria- 

 tion extremely indistinct; length "0008, breadth "0004. 



It seems not improbable that this variety is identical with that de- 

 scribed as !Navicula oblongella by Schmidt, Atlas der Diat., T. vii., 

 fig. 53. 



Camolin, Co. Yi'-exford. 



(i) Clavatce. 



Valves ellixjtical ; strice in two distinct hands, one marginal, another 

 close to the median line, ivitli a wide elliptical intervening space. Mar- 

 ginal land of strice lunate on the inner margin. 



Namcida clavata, (Gregoiy). Marine. 



Yalve broadly elliptical ; ends broadly produced and rounded ; 

 striae moniliform, marginal band broad, narrowing towards the ends ; 

 inner bands of stri^ separated fi'om the median line by a narrow 

 unstriate space, bending outward near the central nodule, where they 

 terminate sharply, making a wide free space about the central nodule ; 

 space intervening between the inner and outer bands of striae un- 

 striate, broad and lunate; length about -0050, breadth about -0026. 

 (Plate 32, fig. 23.) 



Gregory, Q. J. M. S. Trans. 1856, p. 46, PI. v., fig. 17. Ealfs, 

 in Pritch., p. 898. Donkin, IS". H. Brit. Diat., p. 15, PL ii., fig. 8.— 

 JS'avicula lyra, Eab. El. Eur. Alg., sect, i., p. 178. 



Stomachs of Ascidians, Co. Clare. Stomachs of Ascidians, Pound- 

 stone Bay ; stomachs of Ascidians, Broadhaven Bay, Arran Islands, 

 Co. Galway. 



