390 Proceedings of the Royal Irish Academy. 
cluded within the inner margins of the inner striate bands narrow, linear, 
forming in the middle a very narrow stauroform line; space interme- 
diate between the outer and inner striate bands occupied by lines of 
strie, which are prolongations of the strie of the marginal band; 
striez close, punctate, radiate; length -0045, greatest breadth -0018. 
This form is one of very rare occurrence, only three specimens 
having been noticed. The only forms I have seen figured which bear 
resemblance to this very striking species are those of Mastogloia jeli- 
ninekiana, Grunow, Reise S. M. Novara um die Erde, T.1. A., fig. 11; 
and Navicula irrorata, Schmidt, Atlas der Diat., T.u., fig. 19. As 
to the former, even a cursory examination suffices to show that this 
form is perfectly distinct. As to the latter, the inner and outer bands 
of striz are 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 respected President of the Royal Irish Academy. (Plate 382, 
fig. 34.) 
Stomachs of Ascidians, Roundstone Bay; stomachs of Ascidians, 
Broadhayen Bay, Co. Galway. 
(j) Lyrate. 
Similar to the last sub-group, and distinguished by the bending in at 
the middle of the marginal striate band, which consequently vs bilunate on 
the inner margin. The intermediate free space is more or less distinctly 
lyrate. 
Nawvicula wrightii, (O’Meara). Marine. 
Valve linear elliptical; ends broadly produced; marginal band of 
strie tolerably wide, projecting inwards slightly in the middle; strice 
moniliform, nearly parallel at the middle, slightly radiate towards the 
ends ; inner band of strie narrow, expanded at the ends; intermediate 
space between the inner and outer bands of striee wide, unstriate; length 
‘0045, breadth 0018. (PI. 82, fig. 35.) 
Navicula wrightii, var. Q. J. M. S., 1867, p. 116, Pl. v., fig. 46.— 
Navicula caribea, Schmidt, Atlas, T. u1., fig. 17. 
Arran Islands ; Stomachs of Ascidians, Roundstone Bay ; Stomachs 
of Ascidians, Broadhaven Bay, Co. Galway. 
Navicula spectabilis, (Gregory). . Marine. 
Valve broadly elliptical; marginal band of strie broad in the 
middle, and gradually decreasing towards the ends; inner band of 
strie wide; strie 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 
