O’Mrara—Report on the Irish Diatomacee. 391 
narrow longitudinal nebulous belt, which runs conformably with the 
inner edge of the marginal band of strie; length -*0044, breadth 
"0025. 
Gregory, Diat. of Clyde, p. 481, Pl. ix., fig. 10. Ralfs, in 
Pritch., p. 898. Rab. Fl: Eur. Alg., sect.1., p.178. Donkin, N. H. 
Brit. Diat., p. 12, Pl. i., fig.5. Cleve, Om Svenska och Norska Diat., 
p. 226. 
Arran Islands; Stomachs of Ascidians, Roundstone Bay ; Stomachs 
of Ascidians, Broadhaven Bay, Co. Galway. 
Var. sub-orbicularis, (O’Meara). Marine. 
In all respects resembling the typical species, but nearly orbicular ; 
the marginal band of striz relatively broader, the inner band of strie ; 
as well as the intermediate space between the inner and outer striate 
bands much narrower; length -0024, breadth -0018. (Plate 32, 
fig. 36.) 
Navicula spectabilis, var.? Schmidt, Atlas der Diat., T. ii. fig. 31. 
Arran Islands; Stomachs of Ascidians, Roundstone Bay; Stomachs 
of Ascidians, Broadhaven Bay, Co. Galway. 
Nawvicula lyra, (Ehr.) Marine. 
Valve linear elliptical; ends broadly produced; marginal band of 
strie broad ; inner band broad, incurved in the middle; intermediate free 
space between the inner and outer bands of striz very narrow; ends 
pointed and directed outwards; strize moniliform ; length, about ‘0040, 
breadth, about 0014. (Plate 33, fig. 1.) 
Kiitzing, Bac., p. 94, T. xxvui., fig. 55, who refers the species to 
Ehrenberg. Gregory, Diat. of Clyde, p. 485, Pl. ix., fig. 138d. Ralfs, 
in Pritch., p. 897, who remarks, ‘‘ Either Navicula lyra is very vuria- 
ble, or more than one species has been included under the name.” 
Heiberg, De Danske Diat., p. 80, who includes this form and the 
variety elliptica. Cleve, Om Svenska och Norska Diat., p. 226. 
Donkin, N. H: Brit. Diat.; p. 14, Pl. u., fig. 7. Schmidt, Atlas der 
IDratz, AP Saas) figs 1.6) 
River Slaney, Killurin, Bannon, Co. Wexford. Malahide, Port- 
marnock, Co. Dublin. Seaweeds, Portrush, Co. Antrim. Caum 
Lough, near Tralee, Lough Gill, Co. Kerry. Salt marsh, Kilcool, Co. 
Wicklow. Kilkee, Co. Clare. Arran Islands; Stomachs of Asci- 
dians, Broadhaven Bay; Stomachs of Ascidians, Roundstone Bay Co. 
Galway. Stomachs of Ascidians, Belfast Lough. 
Var. elliptica, (Wm. Smith). Marine. 
Valve elliptical; greatly attenuated at the ends ; marginal band of 
strie very broad; inner band of strie narrow; intermediate free 
space between the inner and outer striate bands narrow; incurvyed in 
