do+ Proceedings of the Royal Irish Academy. 
branous above. Margin irregularly ramulous. Trustules in files, few, 
sub-distant. Valve elliptical, delicately striate.’ Wm.Smith. Not 
unlike the last, except that it is more delicately striate, shorter, 
broader, and more rounded at ends. 
Kitz, Bac.) p.115, T: xxvii. dig. 92) Wm, om, sb: Dvn. 
p. 75, Pl. lvi.., fig. 860. Rab. Fl. Eur., sect. 1, p. 268.—Micromega 
mucosum, Ralfs, in Pritch., p. 933. 
With seaweeds, Galway, Dr. David Moore. Malahide, Howth, Co. 
Dublin. 
Schizonema ramosissimum, (Agardh.) Marine. 
‘« Frond filiform, much divided from the base, and irregularly sub- 
membranous by cohesion above. Ramuli short, obtuse. Frustules 
numerous, in closely packed files. Valves clliptico-lanceolate, acute.”’— 
Wm. Smith. Striz fine, linear. : 
Agardh. Syst., p. 11. Harvey’s Manual, p. 210, who, according 
to Smith, had the opportunity of inspecting authentic specimens. 
Wm.Sm., B.<D.;. Vol.-ti.,. p.78,4Pl. dix, fie 369. Rab. ieee, 
p- 272.—Micromega ramosissimum, Agardh. Consp., p. 22. Ralfs, in 
Pritch., p. 934. 
Near Larne, Carnlough, Co. Antrim, collected by Dr. David 
Moore. 
(tt). Hrustules having radiate strie. 
Schizonema grevillii, (Agardh.) Marine. 
‘‘Frond filiform, much divided from the base, Ultimate ramuli 
acute, larger divisions with several files ; ultimate ramuli with a single 
file of frustules. Valve lanceolate.”—Wm. Smith. Strie fine, gently 
radiate. On the front view, frustules are very wide, quadrangular. 
The side view appears nearly as far as the median line. ‘The central 
nodule thus seen is depressed. The connecting band exhibits longitu- 
dinal lines. (Pl. 29, fig. 19.) 
Agardh. Conspect., p. 19. Kitz. Bac., p. 114, T. xxvi., fig. 4., 
1. v.,.figt 1... Wm. Sm, B.D. Vol ai i ee isa pee ease 
Ralfs, in Pritch., p. 928. Rab. Fl. Eur., sect. 1, p. 267.—Schizonema 
quadripunctatum, Harvey’s Manual, p. 214. 
Larne, Carrickfergus, Co. Antrim, collected by Dr. David Moore. 
Malahide, Merrion, Co. Dublin. River Nannywater, near Laytown, 
Co. Meath. 
Schizonema helmintosum, (Chauvin.) Marine. 
‘‘ Frond filiform, or by cohesion irregularly sub-membranous ; much 
andirregularly divided; ultimate divisions short, abrupt.” — Wm. Smith. 
Frustules linear, elliptical, sometimes sharp, sometimes more rounded 
