396 Proceedings of the Royal Irish Academy. 
arcuate, unstriate; marginal band of strie relatively broad; strie 
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. vii. fig. 45. In my form the coste 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. 
Navicula eugenia, (Schmidt). Marine. 
Valve 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 strix, 
striate; striz fine, linear, nearly parallel throughout; length 0002, 
breadth, -0007. (Plate 33, fig. 13.) 
Schmidt, Atlas der Diat., T. vii., fig.44. From Campeachy Bay. 
Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Tavicula scutellum, (O’Meara). Marine. 
Valve broadly elliptical, narrowed and rounded at the ends ; median 
compartment broad, linear, slightly curved at the ends, slightly con- 
. stricted in the middle ; central nodule large, quadrangular, but slightly 
incurved at the ends ; compartments at either side narrow, unstriate, the 
ends of the striz of the marginal band sometimes appearing as beads on 
the outer edge; marginal striate band broad: strie costate, nearly 
parallel in the middle, more and more radiate towards the ends; length 
about °0025, breadth about:0015. (Plate 33, fig. 14.) 
Pinnularia scutellum, O’Meara, Q. J. M. S., 1869, p. 151, Pl. xu. 
fig. 5. 
Arran Islands, Co. Galway. 
Navicula suborbicularis, (Gregory). Marine. 
Valve suborbicular, 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; striz radiate, finely costate, with obscure moniliform strize 
interposed; the coste only continued across the contiguous compart- 
ment; length :0025, breadth 0016. (Plate 33, fig. 15.) 
Ralfs, in Pritch., p.898 5 ‘Donlan, N. Hi wint rnp. Seek, 
fig. 9. Schmidt, Atlas der /)at., T. vill, fig. 5—Navicula smithu, 
var. suborbicularis, Gregory, Diat. of Clyde, p. 15, Pl. ix., fig. 17. 
Ascidians, Roundstone Bay; Arran Islands, Co. Galway. 
