O’Mrara—Report on the Irish Diatomacee. 305 
Var. linearis, (Wm. Sm.) Fresh water. 
Smaller than the preceding var., and on side view somewhat 
linear. (PI. 28, fig. 21.) | 
Synedra fasciculata, Wm. Sm., B.D., Vol.i. p. 73, Pl. x1, fig. 
100, who has inaccurately confounded this fresh water species with 
Synedra fasciculata, Kitz. Bac., p. 68, T. xv., fig. 5, which is clearly 
a marine species.—Synedra parvula, Kiitz., according to Grunow, 
Verhand. der Zool. Bot. Gesel., Band xii., 1862, p. 392, T. iv., fig. 17, 
where the form is accurately figured; but as it is impossible to identify 
it with Kiitzing’s figure of the species so named, I consider it more 
conducive to accuracy to refer this species to Smith, who has so accu- 
rately described it; and as his specific name must be abandoned for the 
reason given, and that adopted by Grunow is not quite certain, I have 
given it a name characteristic of its general appearance. It is to be 
noted that Smith separates this form from those with which it stands 
related; but Grunow and Rabenhorst coincide with me as to its inti- 
mate relation to the group of which Synedra pulchella is the type. 
Tacumshane, Co. Wexford. Tide pool, Malahide. In both which 
marine and fresh water forms were mixed up, but I found it likewise 
mixed with the preceding variety on the surface of wet rocks at 
Black Castle, Co. Wicklow. 
f 
(d.) Strie interrupted by a narrow longitudinal sulcus; valves 
linear. 
Synedra capitata, (Ehr.) Fresh water. 
Frustule on front view linear, expanded slightly at the ends; on 
side view linear, with expanded triangular head. (Pl. 28, fig. 22.) 
Bie. totus, t. <x, ue 29.  Kutz.- Bac. p..6/, £. xv., fir, 19. 
Wir om, .b: 1). Vol..1,, p.. 72, Pl. xi, fie, 94. Rab. .Sussw:, Diat., 
Peo, heaty te Ohaus el) EMUCh., Dif SO, Linlv, Te, 29. and. xz, 
fig. 185. Grunow, Verhand. der K. K. Zool. Bot. Gesel., Band xii., 
1862, p. 394. Heiberg, De Danske Diat. p.65. Cleve, Om Svenska 
och Norska Diat., p. 220. 
In Smith’s figure there appears a short median line terminating 
towards the centre in small pear-shaped nodules, and also a central 
free space; the same features appear in the figure of Ralfs, in Pritchard, 
but these peculiarities do not occur in the numerous specimens which 
have come under my observation. 
Tacumshane, Co. Wexford. Ditch at railway station, Dundalk, 
Co. Louth. Stream, Crossdoney, Co. Cavan. Lucan. Dundrum. 
Boat harbour, Dolphin’s barn, Co. Dublin. Royal Canal, Enfield, Co. 
Meath. Royal Canal, Kilcock, Co. Kildare. Kilcool, Co. Wicklow. 
The Callows, Ballinasloe, Co. Galway. Limestone quarry, Mullingar, 
Co. Westmeath. Lough Mourne deposit. 
