O'Meara — Report on tJtc Irish Diatomacece. 391 



narrow longitudinal nebulous belt, wliich runs conformably -witli the 

 inner edge of the marginal band of stiice ; length -0044, breadth 

 •0025. 



Gregory, Diat. of Clyde, p. 481, PI. ix., fig. 10. Ralfs, in 

 Pritch., p."898. Eab. Fl. Eur. Alg., sect, i., p. 178. Donkin, IS". H. 

 Brit. Diat., p. 12, PI. ii., fig. 5. Cleve, Om Svenska ochXorskaDiat., 

 p. 226. 



AiTan Islands ; Stomachs of Ascidians, Eoundstone Bay ; Stomachs 

 of Ascidians, Broadharen Bay, Co. Gal"^ay. 



Var. sub-orlicularis, (O'Meara). lEarine. 



In all respects resembling the typical species, but nearly orbicular j 

 the marginal band of striae relatively broader, the inner band of striae ; 

 as well as the intennediate space between the inner and outer striate 

 bands much narrower; length -0024, breadth '0018. (Plate 32, 

 fig. 36.) 



I^avicula speetabilis, var. ? Schmidt, Atlas der Diat., T. ii. fig. 31. 



Arran Islands ; Stomachs of Ascidians, Eoundstone Bay ; Stomachs 

 of Ascidians, Broadhaven Bay, Co. Galway. 



KavicuJa hjra, (Ehr.) !ilarine. 



Yalve linear elliptical ; ends broadly produced ; marginal band of 

 striae broad ; inner band broad, incurved in the middle ; intermediate free 

 space between the inner and outer bands of stiiae very narrow ; ends 

 pointed and directed outwards ; stiias moniliform ; length, about '0040, 

 breadth, about "0014. (Plate 33, fig. 1.) 



Kiitzing, Bac, p. 94, T. xxviii., fig. 55, who refers the species to 

 Ehrenberg. Gregory, Diat. of Clyde, p. 485, PI. ix., fig. 135. Ealfs, 

 in Pritch., p. 897, who remarks, " Either Xavicula lyra is veiy varia- 

 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 JN'orska Diat., p. 226. 

 Donkin, E". H. Brit. Diat., p. 14, PL ii., fig. 7. Schmidt, Atlas cler 

 Diat., T. ii., fig. 16. 



Eiver Slaney, EjIIiutq, Bannon, Co. "W'exford. Malahide, Port- 

 mamock, Co. Dublin. Seaweeds, Portrush, Co. Antrim. Caum 

 Lough, near Tralee, Lough Gill, Co. Kerry. Salt marsh, Kilcool, Co. 

 Wicklow. Kilkee, Co. Clare. Ari'an Islands ; Stomachs of Asci- 

 dians, Broadhaven Bay ; vStomachs of Ascidians, Eoundstone Bay Co. 

 Galway. Stomachs of Ascidians, Belfast Lough. 



Var. elliptica , (Wm. Smith), llarinc. 



Yalve elliptical ; greatly attenuated at the ends ; marginal band of 

 striae very broad ; inner band of striae narrow ; intermediate free 

 space between the inner and outer striate bands nan'ow ; inciuwed in 



