O'Meara — Report on the Irish Diatomaccce. 331 



or a new genus established to receive it." — Schizonema eximium, 

 Thwaites, Ann. Xat. Hist., Marcli, 1848. Eab. Fl. Eur., sect. 1, 

 p. 266. — Gloionema signioides, Ehr. Abb., 1845, p. 78. — Encyonema 

 sigmoides, Kiitz. Alg., p. 62. — Endosigma eximium, De Breb. 



Tacumshane, Co. "Wexford. Xear EailTvay station, Xewtown- 

 limayady, Co. Derry. 



CoUetonema xuJgare, (ThTraites). Fresh. Tvater. 



Frond occasionally dirided ; fiaistules elliptical, lanceolate, strise 

 very fine. 



In Smith's figure the strife are described as radiate, but I have 

 never been able to resolve them. 



"\Vm. Sm., B. D., Yol. ii., p. 70, PI. Ivi., fig. 351. Gninovr, 

 Yerhand. dor K. K. Zool. Bot. Gesel., Band x., 1860, p. 572. Ealfs, 

 in Pritch., p. 926. — Schizonema vulgare, Thwaites, Ann. jSTat., Hist., 

 2nd Series, Yol. i., p. 10, PL xii., fig. H. Ptab. Fl. Eur., sect. 1, 

 p. 265. — Xavicula vulgaris, Heiberg, De Danske Diat., p. 83. 



Carrickmacreilly ^Mountain near Glanealy, Y'ickloTr : the spe :ies is 

 very uncommon. 



CoUetonema neglectum, (Th"U"aites.) Fresh water. 



Frond slightly divided ; frustules closely packed ; elliptical, lan- 

 ceolate ; extremities obtuse ; strife finely costate, radiate. (PI. 29, 

 fig. 15.) 



^m. Sm., B. D., Yol. ii., p. 70, PL Ivi., fig. 352. Ealfs, inPiitch., 

 p. 926. Grunow, Yerhand. der K. K. Zool. Bot. Gesel., Band x., 

 p. 571. — Schizonema neglectum, Thwaites, Ann. 'Eo.t. Hist., 2nd 

 Scries, Yol. i. p. 11, PL xii., J. Eab. Fl. Eur., sect. 1, p. 265. 



Genus lY. Beekeleta, Greville. 

 Frond branched, the branches springing from a basal tubercle. 



Host authors adopt this genus, but Heiberg rejects it as unneces- 

 sary, and includes the species under Xavicula. 



Berheleya fragilis, (Greville.) Marine. 



Frustules closely packed in the tubes. Yalves elliptical, lanceo- 

 late, broadly rounded at the ends. Striae obscure. (PL 29, fig. -16.) 



Grev. Scot. Crypt. Flora, tab. 294. Do. Brit. Flora, p. 41 6. Ealfs, 

 iVnn. !N'at. Hist., 1st Series, Yol. xvi., PL iii., fig. 2. Do., in Pritch., 

 p. 926. Kiitz. Bac, p. 109. ^^m. Sm., B.D., Yol. ii., p. 67, PL liv., 

 fig. 344. Grunow, Yerhand. der K. K. Zool. Bot. Gesel., Band x., 

 1860, p. 512. Eab. FL Eur., sect. 1, p. 264.— Navicula fragilis, Hei- 

 berg, De Danske Diat., p. 84. Bangia micans, Lyngbye, Tent. Hydro- 



R. 1. A. rilOC, SEE. II., VOL. II., 8CIENCE. 2 Q 



