EXPLANATION OF THE PLATES, 115 
LowER CARBONIFEROUS SHALES.—This small species is very characteristic of 
the Lower Limestone shales in Ireland. General Portlock says: ‘+ It is of 
eculiar interest as occurring in great abundance in peculiar shales, and 
aving been traced from Derry by Tyrone into Fermanagh.” It has 
been collected by the Geological Survey in the Lower Carb. shales of 
the counties of Cork, Tipperary, Londonderry, and Armagh, 
Fic. 7.—a, 6. PLevRoRuyNcuus Hisernicvs, Sowerby, sp. 
Cardium, Sow. Min. Conch., pl. Ixxxii., figs. 1, 2, and pl. dlii., fig. 5. 
Pleurorhynchus, Phil. Geol. Yorks., vol. i1., pl. v., fig. 26. 
Original. a. Partly restored figured, showing the long siphonal tube at the 
truncated or posterior end. 0%, Portion of posterior margin, hood en- 
larged to show croos striz. Carboniferous Limestone, near Rathkeale, 
Co. Limerick. Mus. G. S. I. 
Carboniferous Limestone.—Frequent in the limestone of the S. of Ireland. 
In England, it occurs at the Mendips, Bolland, &c. Geol. of Yorks., 
vol. ii., p. 210. 
Fig, 8,—ANTHRACOSIA CENTRALIS, Sowerby, sp. 
Unio, Sowerby, Geol. Trans., second series, vol. v., pl. xxxix., fig. 13. 
Original. From Coal Measure shale, Wednesbury, Staffordshire, Dr. Frazer, 
coll. 
Coal Measures.— Abundant in the coal shales at St. Helens, near Liverpool, 
and in clay Ironstone, Coalbrookdale, &c. 
Fic. 9.—(?) Myacires Omarrana, De Koninck, sp. 
Pholadomya, Kon. Anim. Foss., p. 65, pl. v., fig. 4. Myacites (?) Morris’ 
Cat. Brit. Foss., p. 213. 
Original. From Carb. Limest. Lisbane, Co. Limerick. Mus. G.S. I. 
Carboniferous Limestone.—Derbyshire ; counties Limerick, Dublin, and 
Armagh. 
Fie. 10.—CarpiomMoRPHA OBLONGA, Sowerby, sp. 
Tsocardia, Sow. Min. Conch., pl. eceexci., fig. 2. Cardiomorpha, Morris’ 
Cat. Brit. Foss., p. 191. 
Original. From Carb. Limest. St. Doolagh’s, Co. Dublin. 
CaARBONIFEROUS LimesToNE.—Bolland, Yorkshire; counties Cork, Lime- 
rick, Dublin, &c. 
Fic. 11.—a, 6. Curtonotvus Etecans, Salter. 
Journ. Geol. Soc., vol. 19, p. 474. Expl. Sheet, 187, &c., Geol. Surv., 
Trel., pp. 27, &c., fig. 6 a, b. 
Original. a. Exterior of shell. 6. Hinge of left valve. 
Urrer Devontan and Lower Carsontrerous.— Upper Devonian Pilton 
group (Etheridge). Coomhola grit, Co. Cork. 
This Bivalve with other species is frequent at several localities in the county 
Cork. Expl. 187, &., G.S. L., p. 17, 
