372 Proceedings of the Royal Irish Academy. 



J^avicida translucida, [N". S. IMarine. 



Yalve lanceolate, transverse striae obvious, costate, radiate ; longi- 

 tudinal striae, two or thi-ee obvious; length, -0020, breadth, -0003. 

 (PL 31, fig. 41.) 



Stomacbs of Ascidians, Co. Clare. 



Navieula pa/piJdifera, jS". S. Marine. 



Yalve elliptical-lanceolate, ends produced, papillif orm ; median 

 line incurved and expanded towards the central nodule ; intennediate 

 free space narrow ; transverse strife obsolete, longitudinal striae ob- 

 vious, numerous; length -0020, breadth -0006. (PL 31, fig. 42.) 



Stomachs of Ascidians, Eoundstone Bay. 



Navietda lilurnica, (Grun.) Marine. 



Yalve elliptical, lanceolate, transverse striae fine, linear, slightly 

 radiate ; longitudinal stri» indistinct, yet with good light noticeable ; 

 intermediate free space narrow, lanceolate. (PL 31, fig. 43.) 



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

 547, T. iii., fig. 25. Eab. PL Eur. Alg., sect, i., p. 172. 



Stomachs of Ascidians, Co. Clare. Stomachs of Ascidians, B-ound- 

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



Nmicida jylumlicolor, N. S. Maiine. 



Yalve linear, with rounded ends ; length, '0018; breadth, '0007; 

 transverse striae veiy obscure, punctate, radiate, longitudinal sulcus 

 sub-marginal ; longitudinal strife more easily observed than the trans- 

 verse ; intermediate fi'ee space narrow, linear ; dry valve of a leaden 

 colour. (PL 31, fig. 44.) 



Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 



Navicxda veneta, (Kiitz.) Brackish water. 



Yalve minute; length, -0010; breadth, "0003; lanceolate, ends 

 slightly produced ; transverse striae faint, convergent in the middle ; 

 longitudinal striae noticeable with good illumination ; longitudinal 

 free space narrow, linear. (PL 31, fig. 45.) 



Kiitz. Bac, p. 95, T. xxx., fig. 76. Donkin (K H.. Brit. Diat., 

 p. 43, PL vL, fig. 13,) rightly observes that the form "is abun- 

 dant in estuaries and harbours between tide marks." Rab. Siissw. 

 Diat., p. 39, T. vi., fig. 83. Ealfs, in Pritch., p. 901. Xone of the 

 above authors refer to the longitudinal striae, wliich, however, by 

 careful illumination may be easily detected if the valves be diy. 



Mouth of Bray Eiver, Co. "Wicklow. DoUymount Strand, Co. 

 Dublin. Galway Bay, near to-\vn of Galway. 



