390 Proceedings of the Royal Irish Academy. 



cliideclTrithin the inner margins of the inner striate bands narrow, linear, 

 forming in the middle a very narrow stanroform line ; space intenne- 

 diate between the onter and inner striate bands occupied by lines of 

 strife, which are prolongations of the striae of the marginal band ; 

 sti'ise close, punctate, radiate; length -0045, greatest breadth "0018. 



This foiTa is one of very rare occiuTence, only three specimens 

 having been noticed. The only forms I have seen figni'ed which bear 

 resemblance to this very striking species are those of ^tlastogloia jeli- 

 nineldana, Grunow, Heise S. M. JS^ovara um die Erde, T. i. A., fig. 11 ; 

 and Xavicula iiTorata, Schmidt, Atlas der Diat., T. ii., fig. 19. As 

 to the former, even a ciu-sory examination suffices to show that this 

 f onn is perfectly distinct. As to the latter, the inner and outer bands 

 of striae ai'e separated by an intervening blank space, whereas in the 

 present case the corresponding intermediate space is distinctly striate. 



This beautiful species I wish to identify with the name of the 

 present resj)ected President of the Roval Irish Academv. (Plate 32, 

 fig. 34.) 



Stomachs of Ascidians, lloundstone Bay; stomachs of Ascidians, 

 Proadhaven Pay, Co. Galway. 



(j) Lyratce. 



Sirmlar to the last suh-yroiqj, and distinguished hy the lending in at 

 the middle of the marginal striate land, ichich consequently is lilunate on 

 the mner margin. The intermediate free space is more or less distinctly 

 lyrate. 



Navicula tcriyhtii, (O'lMeara). ITarine. 



Yalve linear elliptical ; ends broadly produced ; marginal band of 

 strifE tolerably wide, projecting inwards slightly in the middle ; striae 

 moniliform, nearly paraPel at the middle, slightly radiate towards the 

 ends ; inner band of striae narrow, expanded at the ends ; intermediate 

 space between the inner and outer bands of striae wide, unstriate; length 

 •0045, breadth -0018. (PI. 32, fig. 35.) 



Xavieula wrightii, var. Q. j. M. S., 1867, p. 116, PL v., fig. 46. — 

 Xavicula caribea, Schmidt, Atlas, T. ii., fig. 17. 



AiTan Islands ; Stomachs of Ascidians, Poundstone Bay ; Stomachs 

 of Ascidians, Broadhaven Pay, Co. Galway. 



Navicula spectalilis, (Gregory). lEarine. 



Yalve broadly elliptical ; marginal band of striie broad in the 

 middle, and gradually decreasing towards the ends ; inner band of 

 striae wide ; striae moniliform, nearly parallel in the middle, slightly 

 radiate towards the ends ; intermediate space between the inner and 

 outer bands of striae very wide, unstriate, but interrupted by a 



