O'Meara — Report on the Irish Diatomaccce. 343 



Tvliicli latter he refers to as Nayiciila lata, p. 908. Grunow, Yerliand. 

 der K. K. Zool. Bot. Gesel., Band s., 1860, p. 515. — Pinnularia 

 pachyptera, Eab. Siissw. Diat., p. 44, T. vi., fig. 11. — Pinnularia 

 lata, Wm. Sm., B. D., Vol. i., p. 55, PL xviii., fig. 167. Kiitzing 

 describes a fonn as JN^a^•icula lata, Bac, p. 92, T. iii., fig. 51, ■which is 

 obviously different from the present! 



Pool, Glencree, Co. "WickloTV. Eiver Dodder, Featherbed Moun- 

 tain, Co. Dublin. Eiver Bann, near Hilltown, Co. Down. 



Kaiicula distans, (Wm. Sm.) Marine. 



Prustule on front Tiew slightly constricted in the middle, and 

 gently attenuated at the ends; valve lanceolate, length about "0045, 

 breadth about -0010 ; costte not so robiist as in the preceding ; conver- 

 gent ; intermediate free space lanceolate, much expanded in the 

 middle and narrow towards the ends. (Plate 30, fig. 6.) 



Grunow, Yerhand. der K.K. Zool. Bot. Gesel., Bandx., 1860, 'p. 523. 

 Ealfs, in Pritch., p. 907. Clove, Om Svenska och J^orska Diat., p. 224. 

 — Pinnularia distans, Wm. Sm., B. D., Yol. i. p. 56, PI. xviii., fig. 169. 

 Eab. PL Eur. Alg., sect. 1, p. 214. 



Sea-weeds, Bannow, Co. Wexford. Sea-weeds, Malahide, Sto- 

 machs of Pectens, Dalkey, Piles of wooden bridge, DoUymount 

 Strand, Sea-weeds, Howth, Co. Dublin. Stomachs of Ascidians, 

 Belfast Lough, Co. Antrim. Stomachs of Ascidians, Co. Clare. Sea- 

 weeds, Kilkee, Co. Clare. 



Kavicula undulata, I^. Sj Marine. 



Lenglh of valve "0060, breadth, '0015; lanceolate with rounded 

 ends; median line undulate, intermediate free space lanceolate, greatly 

 expanded in the middle; costse strong, convergent. (PL 30, fig. 7.) 



Sea-weeds, Giants' Causway, Co. Antrim. 



Navicula rectmiguTata, (Gregory.) Marine. 



Yalve linear; length about '0040, breadth about '0010; slightly 

 expanded at the middle and ends, which latter are rounded; inter- 

 mediate free space narrow at ends, but roundly expanded in the 

 middle ; costal strong, converging in the middle, and radiate towai'ds 

 the ends ; frustule on front view constricted in the middle. (Plate 

 30, fig. 8.) 



Gregoiy, Diat. of Clyde, p. 479, PL ix., fig. 7. Donkin, N. H. 

 Brit. Diat., p. 66, PL x., fig. 5. — Pinnularia rectangulata, Eab. Fl. 

 Eur. Alg., sect. 1, p. 215. 



Stomachs of Ascidians, Broadhaven, Co. Galway. 



