114 EXPLANATION OF THE PLATES. 
burnt umber colour. These beautiful fossils were collected by Cap- 
tain R. B. Bennett, from the Carboniferous Limestone of Kildare, and 
are partly in his collection, and in that of the Rev. John Grainger, D. D., 
Broughshane, near Ballymena. 
CARBONIFEROUS LimEsTONE.—Many localities in Ireland, amongst them 
Kilgrogan, Co. Limerick ; Ballyrichards, Co. Cork; St. Doolagh’s and 
Cloghran,Co, Dublin. At the latter place it has also been found, showing 
zigzag bands of colour. Specimens from all these localities are in the 
Mus. Geol. Surv., Ireland. 
Fic. 4.—Postponomya Becuert, Bronn. 
Leth. Geog., pl. i1., fig. 17, Sowerby, Geol. Tr., second series, vol. v., 
pl. lii., fig. 2—4. Phillips’ Pal. Foss., pl. xliv., &c., pl. xxii. f. 72, 73,74. 
Original. View of the two valves in near proximity ; the thinness of the shell 
is apparent from the impression of the underneath valve being shown 
through the upper one. From junction beds between the Upper Car- 
Eee and Lower Coal Measures, Loughshinny, Co. Dublin. Mus. 
Gas, 
P. lateralis and tuberculata are synonyms of this species. 
CARBONIFEROUS LIMESTONE AND CoAL MrAsures.—Carb. Limestone, 
Budle, Northumberland, Morris’ Cat.,p. 181. A very characteristic shell 
at the junction of the Upper Carb. Limest. and Coal Measures in the 
counties of Dublin and Meath, and especially abundant in the dark grey 
contorted and cleaved shales, W. of Lispatrick, Old Head of Kinsale, 
Co. Cork; it occurs also in the Coal Measure shales of Foynes Island, 
Co. Limerick; near Ennis, Co. Clare; at Navan and near Trim, Co. 
Meath; and Loughshinny and Garristown, Co. Dublin. In some of 
these places it occurs in profusion in regular layers. 
It is stated by Sir R. Murchison* that “it was through the discovery of this 
striking species in Carboniferous strata on the Coast of Northumberland 
(it also occurring in the ‘Calp.’ Coal Measures of Ireland), that the thin 
beds of black culm limestone in Devonshire, wherein it also occurs, are 
known to be of this age.” 
Fic. 5.—PostponomyA MEMBRANACEA, Jf‘ Coy. 
Posidonia Synopsis Carb. Foss. Irel., p. 78, pl. xiii, f. 14. 
One ne un black shale Lower Coal Measures, Balla, Co. Mayo. Mus. 
rene 
Coat Measures.—This transversely elongated shell is not unfrequent in the 
lower coal shales of Ireland. It must have been extremely thin, or per- 
haps membranous—and evidently belongs, like the preceding species, to 
the Aviculoid group of Bivalves. 
Fic. 6.—Mopriora Macapamt, Portlock. 
Geol. Rep. p. 452, pl. xxxiv., figs. 13—15, and M. suparailela, fig. 16. 
Original. Showing both valves, Lower Carb. shale. Clogher, Co. Tyrone, 
Mus. G. S. I. 
* Siluria (1869), p. 291, 
