O'Meara — Report on the Irish Diatomacece. 341 



Navicula major ^ (Kiitz.) Fresh water. 



Valve about the same length as that of N. nobilis; oblong, but veiy 

 slightly expanded in the middle, and at the rounded, somewhat conical, 

 ends ; longitudinal free space narrower than that of N. nobilis ; costcB 

 broad, converging in the middle, and nearly parallel for the remainder. 

 On front view frustnle linear with rounded angles. 



Xiitz. Bac. p. 97, T. iv., fig. 19. Ealfs, in Priteh., p. 896. Grnnow, 

 Verhand. der K. K, Zool. Bot^ Gesel., Band x., 1860, p. 515. Heiberg, 

 De Danske Diat., p. 80. Cleve, Om Svenslca och jSTorska Diat., p. 

 223.— Pinnularia major, W. Sm., B.D.,Vol. i., p. 54,P1. xviii., fig. 161. 

 Eab. Siissw. Diat., p. 42, T. vi., fig. 5. Do. PI. Eur. Alg., sect. 1, 

 p. 210. 



Lower Lake, Killarney, E,iver near Glcncar, Co. Kerry. Hiver 

 Bann, near Coleraine, Co. Derry. Marl pit, near Arklow, Streamlets 

 on Carrickmacreilly Hill, Greenane, Co. Wicklow. Derrylane Lough, 

 Co. Cavan. Killakee, Featherbed Mountain, Co. Dublin. Slieve 

 Donard, Co. Down. Lough Mourne deposit. Dromore Sub-peat 

 deposit. Lough Islandreavy deposit. Pond near Camolin, Co. Wex- 

 ford. 



Navicida cardinalis, (Ehr.) Presh water. 



Yalve oblong-linear, length about -0125; breadth about '0022, 

 rounded at the ends ; median line undulate ; end nodules large ; free 

 intermediate space wide, reaching the margin in the middle, forming a 

 broad stauroform space; costse broad, converging in the middle, nearly 

 parallel for the remainder. (PI. 30, fig. 2.) 



Ealfs, in Priteh., p. 806, PI. xii., fig. 72. Grunow, Yerhand. derK. K. 

 Zool. Bot. Gesel.. Band x., i860, p. 515. — Pinnularia cardinalis, Ehr. 

 ■\Ym. Sm., B.D.,'Yo1. i., p. 55, PI. xix., fig. 166. Eab. El. Eur. Alg., 

 sect 1, p. 220. — Stauroneis cardinalis, Kiitz. Bac, p. 106, T. xxix., 

 fig. 10. 



Lough Mourne deposit ; found also living in a pond near the city 

 of Armagh. 



Navicula viridis, (Nitzsch.) Eresh water. 



Yalve varying much in size ; linear elliptical, with rounded ends \ 

 intermediate free space narrower than in the three preceding species, 

 and not so much expanded in the middle ; costse broad, but not so much 

 so as in the preceding. (PL 30, fig. 3.) 



This species has been attributed to various authors, but if Kiitzing 

 be right in supposing it to be = Bacillaria viridis, Mtzsch, 1817, it 

 should be attributed to the last named author, as Heiberg has done. 

 Smith assigns the species to himself, although regarding it as = Navi- 

 cula viridis, Ehr. Eabenhorst attributes it to himself, while Grunow 

 attributes it to Kiitzing. Grunow makes this form the type of the 

 group Yirides, but seems to regard IS'avicula major, which he includes 



