326 Proceedings of the Royal Lrish Academy. 
Mastogloia closeti,,N. 8. Marine or brackish water. 
Valve somewhat rhomboid; length -0018; breadth *0008; ends 
narrow, lanceolate; median line straight; central nodule very small ; 
marginal plates wide in the middle for a short space, and rapidly 
attenuated long before reaching the ends; loculi generally four in 
number, two large in the middle, and one at either side narrow, at- 
tenuated; space between the inner margin of plates wide, shaped 
somewhat like an hour-glass, with pointed ends; strie fine, linear, 
radiate, reaching the median line. (PI. 29, fig. 10.) 
Found first in a gathering by Rev. Maxwell H. Close, from rock 
pools in the bay called Lough Kay, between Cahirciveen and Doulus 
Head, Co. Kerry. Lough Gill, Co. Kerry. Sea-weeds, Giants’ Cause- 
way, Co. Antrim. 
Mastogloia portierana, (Grunow.) Marine. 
Valves narrow, lanceolate; slightly produced at the apex; mar- 
ginal plates narrow; gradually attenuated towards the ends; loculi 
numerous; strize very obscure. (Pl. 29, fig. 11.) 
This form is very similar in some respects to large specimens of 
Mastogloia lanceolata, but differs in many details; it is longer, and 
proportionately narrower; the sulci at either side of median line in 
the case of M. lanceolata are absent in this; the apices, too, are 
slightly produced, and the strize much finer than in that species. 
Grunow states that, with an amplifying power of 400 times, the striae 
are scarcely noticeable; but in the several specimens examined by me 
with a one-eighth objective and deep eye-piece, the strize could not be 
discovered. Grunow, Verhand. der K. K. Zool. Bot. Gesel., Band xii. ; 
1863, p..157; Tiav., fie: 130 Rab. Pl. Muy sects op. 236k 
From stomachs of Ascidians, Roundstone Bay, Co. Galway. 
Mastoglova dansevt, (Thwaites.) Marine or brackish water. 
Valve linear, elliptical ; broadly rounded at ends; strie reaching 
the median line, but slightly shortened around the central nodule ; 
radiate, formed of close puncta; marginal plates on inner margin 
straight till near the ends, where they are suddenly attenuated ; 
loculi numerous, parallel; space between the plates narrow, and 
shightly expanded at the ends. 
Wm. Sm., B. D., Vol. ii., p. 64, Supp. Pl. Ixii., fig. 388. Ralfs, 
in |Pritch.,. p.! 924, Pl: xvi, fie. 30... Grunows, Verband. dere Je 
Zool. Bot. Gesel., Band x., 1860, p. 576. Rab. FI. Eur., sect. 1, 
p- 261.—Dickieadansei, Thwaites, Ann. Nat. Hist., March, 1848, p.171. 
Smith seems to think that this species hardly differs from Mastogloia 
’ Janceolata, but a careful consideration of the two forms will, I think, 
prove that in all the details they are essentially different. 
Tacumshane, Co. Wexford. Lough Foyle, Co. Londonderry. 
Larne, Co. Antrim. Salt marsh, Kilcool, Co. Wicklow. 
