O’Mrara—Report on the Irish Diatomacee. 275 
Biddulphia baileyii, (Wm. 8m.) Marine. 
Frustules, on front view, receding at the sides in a gentle slope; end 
surfaces nearly flat, with two slight elevations on which the spines are 
situated ; processes long, and narrow towards the extremity, slightly 
curving inwards; striation very obscure; punctate; puncta parallel. 
On side view valves broadly elliptical; processes at extremities of the 
longitudinal axis; spines two, situated a little to the right and left 
of same, about one-third of the entire length from extremities ; strice 
very fine; lines of puncta appearing to cross each other, except upon 
a vacant, sigmoid, narrow space in the middle. (Pl. 27, fig. 8.) 
Wm. Sm., B.D., Vol. ii., p. 50, Pls. xlv. and Ixu., fig. 322. Rab. 
Pl, Bor» seet.c,p: 811. |. Roper Q.J-M2&:,, Oct:; 1858; ps 12, 
Pl.i., figs. 5-9.—Zygoceros mobiliensis, Ralfs, in Pritch, p. 850, 
Pi. vi.) fie: 11, 
Salt ditch near Wexford. Tacumshane, Co. Wexford. Dundalk, 
Co. Louth. Salt marsh, Drehidnamaud, Co. Kerry. 
(b.) Surfaces of the valves undulate. 
Biddulphia pulchella, (Gray.) Marine. 
On front view the sides incline inwards towards the processes ; the 
valves divided into compartments, from three to seven in number, the 
central being the largest and most elevated, from which, in perfect 
specimens, two or three spines are projected; compartments separated 
by what appear strong cost ; processes short, rounded at extremities ; 
striation areolate; arcoles roundish, and nearly parallel; connecting 
zone striate. On side view the valve is broadly elliptical; areoles 
ranged round the central point. (Pl. 27, fig. 9.) 
Wan bm (B.D) Vol. a, p.:48) Pls? xliv.; xlv., xlvi.,. fig. 821. 
Roper, Q. J. M.S., Oct., 1858, p. 7. Ralfs, in Pritch, p. 848, Pl. i., 
figs. 46-50.—Biddulphia trilocularis ; B. quinquelocularis ; B. septem- 
locularis, Kiitz. Bac., p. 138, T. xxix., fig. 89, T. xix., fig. 1, T. xix., 
fig. 2.—Diatoma Biddulphianum, Agardh, Syst. Alg., p.d.—Denticella 
Biddulphia, Ehr., Berl. Trans., 1843. 
Malahide, Iveland’s Eye, Baldoyle, Co. Dublin. Sea-weeds, 
Giants’ Causeway, Co. Antrim. Stomachs of Ascidians, Roundstone 
Bay, Arran Islands, Co. Galway. 
Famity IIT, TRICERATIEZ. 
Valves on side view presenting three or more angles, with a pro- 
cess springing from each angle. 
This group includes the genera Amphitetras, Triceratium and Trina- 
cria, which, in consequence of their obvious resemblance, are placed 
