O’Mrara—Report on the Irish Diatomacee. 387 
Navieula hennedyi, (Wm. Sm.) Marine. 
Valve broadly elliptical, ends not produced; striz moniliform ; 
inner and outward bands of strie, narrower than in Navicula clavata, 
but in other respects very similar; length about -0080, breadth 
about °0020. (Plate 32, fig. 24.) 
Wan. Sm., <b. 0:, Vol. ai.-p. 93. ,,Gregory, Q.J. M.S. Trans. 
1656, p.. 40, Pliy., fig. 3:. Malis; in Prtch., p: 898. “Kab. FI. Eur. 
Ade. sect. 1., p. 178. -Donkan, N. H..Brit. Diat.,.p..11,, Pl..1., fig. 3. 
Schmidt, Atlas der Diat., T. i., figs. 17, 18. 
Stomachs of Ascidians, Belfast Lough, Co. Antrim. Stomachs of 
Ascidians, Roundstone Bay; stomachs of Ascidians, Broadhayven Bay, 
Arran Islands, Co. Galway. 
Navicula nebulosa, (Gregory). Marine. 
Valves in outward form similar to those of Navicula hennedyi, but 
narrower; the space intervening between the outer and inner bands 
of strie obscurely marked with very fine parallel lines of puncta, 
which do not extend throughout; length about -0042, breadth about 
"0020. (Plate 32, fig. 25.) 
Gregory, Diat. of Clyde, p. 480, Pl. ix., fig. 8. Ralfs, in Pritch., 
Paso... Rab, Hl. Hur, Aloy sect. at,.pa179.,; (Donkin, -N. He Brit. 
Wiat.; p. 11, Pl. iw, fi¢-2: “Schmidt, Atlas.der, Diat, T.:111.7, fig. b4: 
The clouded appearance of the space intervening between the inner 
and outer bands of striz, as represented in the figures of Gregory and 
Donkin, is found with good illumination to arise from the fine punctate 
striz above referred to. 
Stomachs of Ascidians, Roundstone Bay, Arran Islands, Co. 
Galway. 
Var. suborbicularis, (O’Meara). Marine. 
Valve shorter and relatively broader than that of the typical 
species; marginal band of striz relatively broader; that next the 
median line relatively narrower ; intermediate space between the inner 
and outer bands of striz narrow, and occupied by irregularly disposed 
puncta; length -0024, breadth 0014. (Plate 32, fig. 26.) 
Arran Islands, Stomachs of Ascidians, Roundstone Bay, Co. 
Galway. 
Navicula pretexta, (Ehr.) Marine. 
Valve broadly elliptical; marginal band of strie broad, distinctly 
moniliform ; median bands of striz broad, distinctly moniliform ; inter- 
mediate space between the outer and inner bands of strize ornamented 
with irregularly arranged large, round puncta; free unstriate space 
between the median line and the inner margins of the inner band of 
strize expanding in the middle, with a narrow stauroform band ; length 
about °0040, breadth about -0025. (Plate 32, fig. 27.) 
Ehrenberg, in Proceedings of Berlin Acad., 1840, p. 20. Kiitz. 
