APPENDIX. 175 



much variation in form. One is figured PI. XXI, fig. 8. It has also been found 

 in the roof of the Bute seam, Dyllas Colliery, South Wales. 



G. aqidlina. — To the synonymy of this species must be added Unio Uftoralis, 

 Brown, 1849, ' Fossil Conchology,' pi. Ixxxviii, 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 lire's " mussel," and which should therefore be the type of Fleming's Uuio 

 JJrei. This shell, which is figured on PI. XXI, fig. 1, is not very easy to identify, 

 but I believe it to be a young specimen of Carhonicola acuta. Sowerby's shell 

 is pubhshed in vol. i of the 'Mineral Conchology,' which is dated 1813; 

 Fleming's ' History of British Animals ' is dated 1826 ; therefore Unio JJrei must 

 be placed as a synonym of Carhonicola acuta, and not, as I have suggested p. 69, 

 of G. aquilina. I would point 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 Garhonicola 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. 



Garhonicola similis (p. 76). — Some fine specimens of this shell have been 

 obtained from some Ironstone measures at Aberdare, by Mr. O'Connor. 



Garhonicola 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 baud 

 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 PI. 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 (PI. XV, figs. 12 — 16, 18, and 20). The position of the umboues and 



