396 Proceedings of the Royal Irish Academy. 



arcuate, unstriate ; marginal band of striae relatively broad ; striae 

 coarse, costate, nearly parallel in the middle, but distinctly radiate 

 towards the ends. (Plate 33, fig. 17.) 



Navicula eugenia, Krit., form from Java, Schmidt, Atlas der Diat., 

 T. viii. fig. 45. In my form the costae are stronger and more remote 

 than in the form described by Schmidt ; still I have little hesitation 

 in regarding them as the same species. 



Arran Islands. Stomachs of Ascidians, Broadhaven Bay, Co. Gal- 

 way. 



Na/oicula eugenia, (Schmidt). Marine. 



Yalve linear elliptical ; ends rounded ; median compartment slightly 

 constricted in the middle, slightly incurved at the ends ; compartments 

 at either side arcuate, nearly as wide as the marginal band of stiise, 

 striate; striae fine, linear, nearly parallel throughout ; length -0002, 

 breadth, -0007. (Plate 33, fig. 13.) 



Schmidt, Atlas der Diat., T. viii., fig. 44. From Campeachy Bay. 



Stomachs of Ascidians, Broadhaven Bay, Co. Gralway. 



Navicula scuteUum, (O'Meara). Marine. 



Valve broadly elliptical, narrowed and rounded at the ends ; median 

 compartment broad, linear, slightly incurved at the ends, slightly con- 

 stricted in the middle ; central nodule large, quadrangular, but slightly 

 incurved at the ends ; compartments at either side naiTOw, unstriate, the 

 ends of the striae of the marginal band sometimes appearing as beads on 

 the outer edge ; marginal striate band broad : striae costate, nearly 

 parallel in the middle, more and more radiate towards the ends ; length 

 about -0025, breadth about -0015. (Plate 33, fig. 14.) 



Pinnularia scuteUum, O'Meara, Q. J. M. S., 1869, p. 151, PI. xii. 

 fig. 5. 



AiTan Islands, Co. Galway. 



Navicida stihorMcidaris, (Gregory). Marine. 



Valve suborbictilar, linear; median compartment wide, with mar- 

 gins distinctly marked, slightly inflexed at the ends, considerably 

 constricted in the middle ; compartments at either side tolerably broad ; 

 bilunate on the inner margin ; marginal striate band broad, lunate on 

 inner edge ; striae radiate, finely costate, with obscure monilif orm striae 

 interposed; the costae only continued across the contiguous compart- 

 ment; length -0025, breadth -0016. (Plate 33, fig. 15.) 



Ralfs, in Pritch., p. 898 ; Donkin, J^. H. Brit. Diat., p. 9, PL i., 

 fig. 9. Schmidt, Atlas der Diat., T. viii., fig. 5. — ISTavicula smithii, 

 var. suborbicularis, Gregory, Diat. of Clyde, p. 15, PL ix., fig. 17. 



Ascidians, Eoundstone Bay ; Arran Islands, Co. Galway. 



