198 BRITISH CARBONIFEROUS BRACHIOPODA. 



form" described by Prof. M'Coy. I am therefore quite disposed to concur in the 

 Irish author's opinion when he considers D. cincta as nothing more than the perfect 

 condition of D. nitida ; for when the outer surface of the last-named shell is absent, 

 which is often the case, the cast is generally almost smooth, or marked only with a few 

 faint concentric and radiating lines, a circumstance which has apparently led some palaeon- 

 tologists to believe that Phillips's shell was smooth, while that of Portlock's was concen- 

 trically striated. 



It is also highly probable that the Permian Discina Koninckii cannot be specifically 

 separated from the Carboniferous D. nitida. 



Discina nitida is a common shell in many localities. In England it is mentioned by 

 Prof. Phillips to occur at Bowes, Pateley bridge, Lee Harelaw and Otterburn ; also 

 at Coalbrookdale. It has been found also at Lowick, Northumberland ; in the upper part 

 of the Carboniferous limestone of Derbyshire, &c. In Scotland it abounds at Belston 

 Place Burn, in Lanarkshire, at 173 fathoms below "Ell Coal," 239 at Gare, 265 at 

 Belston Burn, and 354 at Raes Gill, in the parish of Carluke. It is likewise found at 

 Haw-hill, near Lesmahago; Auchentibber and Calderside, High Blantyre; and Capel- 

 rig, East Kilbride. In Renfrewshire, at Arden Quarry, Thornliebank. In Stirling- 

 shire, at Craigenglen, and in the Balgrochen Glen ironstone, &c. In Ayrshire, at Cragie, 

 near Kilmarnock ; Cessnock, parish of Galston ; and Netherfield, near Strathavon. In 

 Eifeshire, at Strathkenny, St. Andrew's, &c. In Haddingtonshire, at Cat Craig, near 

 Dunbar. It occurs also in Edinburghshire, and along the Berwickshire coast, from the 

 mouth of the Tweed to Ross. In Ireland it occurs at Benburb, Bundoran, Culkagh. In 

 America it has been found in Pike and Adams County, Illinois, &c. &c. 



Discina Davreuxiana, De Koninck. PI. XLVIII, fig. 26. 



Orbicula Davkeuxiana, Be Koninck. Desc. des Animaux Foss. du Terrain Carb. de 



Belg., p. 306, pi. xxi, fig. 4, 1843. 



Spec. Char. Shell marginally oval, longer than wide ; larger or upper valve conoidal 

 or limpet-like, the apex being situated between the centre and the posterior margin. 

 Surface smooth, with concentric, rounded wrinkles. Lower valve unknown. Length 3, 

 width 2£, depth 1 line. 



Obs. I am acquainted with but a single British example, which was found by 

 Mr. Joseph Wright in the Carboniferous limestone of Little Island, near Cork, in Ireland. 

 The specimen bears a close resemblance to the 0. Davreuxiana, but I am still uncertain 

 whether this last is a good species or only a variety of D. nitida, the material at my com- 

 mand not being sufficient to enable me to decide the question. In Belgium it occurs 

 near Tournay. 



