APPENDIX. 175 
much variation in form. One is figured Pl. XXI, fig. 8. It has also been found 
in the roof of the Bute seam, Dyllas Colliery, South Wales. 
C. aquilina.—To the synonymy of this species must be added Unio littoralis, 
Brown, 1849, ‘ Fossil Conchology,’ pl. Ixxxviu, fig. 7. 
The Ure Collection is, I find, preserved in the Museum of the Royal Society 
of Edinburgh, and the Council have kindly lent me the shell which is supposed to 
be Ure’s “ mussel,’”’ and which should therefore be the type of Fleming’s Unio 
Urei. This shell, which is figured on Pl. XXI, fig. 1, is not very easy to identify, 
but I believe it to be a young specimen of Carbonicola acuta. Sowerby’s shell 
is published in vol. i of the ‘Mineral Conchology,’ which is dated 1813; 
Fleming’s ‘ History of British Animals’ is dated 1826; therefore Unio Urei must 
be placed as a synonym of Carbonicola acuta, and not, as I have suggested p. 69, 
of CO. aquilina. I would pomt out that the shell now figured differs much in 
size from Ure’s original drawing, the latter being the representative of a much 
more massive and older shell. 
To the localities where Carbonicola aquilina is obtained should be added the 
roof of the 4-foot seam, Bwllfa Colliery, and the roof of the 2-foot 9-inch seam, 
Galli, and a bed of Ironstone, Aberdare, all in the South Wales Coal-field. Also 
the Yoredale series of Marsden, Pule Hill. ° 
Carbonicola similis (p. 76).—Some fine specimens of this shell have been 
obtained from some Ironstone measures at Aberdare, by Mr. O’Connor. 
Carbonicola turgida.—To the localities for this species (p. 67) should be added 
the Ironstone seam of Aberdare, and Pule Hill in the Yoredale series. 
Anthracomya Adamsii (p. 89).—This shell has been obtained in a bed of iron- 
stone at Aberdeen by Mr. O’Connor, and in a bed of black shale with Ironstone band 
and Cyprid beds a little way below the Burdiehouse limestone on the shore at 
Dalmeny by Mr. James Bennie. The specimens are all crushed flat, but have the 
periostracum well preserved. 
Anthracomya modiolaris (p. 95).—This species has been obtained by Mr. 
O’Connor from the roof of the 4-foot coal, Bwllfa Colliery, South Wales. 
Anthracomya senex (p. 111).—A very perfect example of this species has been 
obtained by Mr. O’Connor from a bed of Ironstone at Aberdare ; I have also. 
obtained this species from the Lancashire Coal-field. 
Anthracomya Wardi (p. 105).—Mr. O’Connor has obtained this species from 
the roof of the Ellad seam, Brysbach, South Wales Coal-field. 
Two very fine shells obtained from the Possil Lower Black-band, in the collection 
of Dr. John Young, resemble very closely certain smaller shells which I figured 
on Pl. XIII, figs. 13, 15, and 16. All the other adult forms, and most of the 
young ones of this species which have come to hand, are compressed, and otherwise 
distorted (P]. XV, figs. 12—16, 18, and 20). The position of the umbones and 
