PLATE LV. 



CARBONIFEROUS SPECIES. 

 Fig. 

 1, 2, 3. Rhynchonella Wettonensis, Dav. Three specimens from Narrowdale, near Wetton, Staffordshire. 



4. Athyris 1 From the Carboniferous Limestone of Wetton. This specimen is here figured, 



but not named or described, on account of the material at hand not being 

 sufficient to warrant the establishing of a new species. It may, perhaps, be 

 an abnormal form of Athyris plano-sulcata 1 



5. Productus Carringtoniana, Dav. Narrowdale, Staffordshire. 



6. 7. „ comoides, Sow. The original examples ('Min. Con.,' tab. 329, lower figures) from 



the Wayboards, between the limestone under the coal, at Llan- 

 gaveni, in Anglesea. British Museum. 

 8. ,, ,, „ ('Min. Con.,' tab. 329, the upper figures). From the same locality 



and collection. Since this specimen was drawn by Sowerby in his 

 ' Mineral Conchology ' I have removed the matrix, so as to 

 expose the interior muscular impressions. The upper attachment 

 of the adductor partially seen (a), of the lower ones (c) are clearly 

 exposed, it. Cardinal or divaricator impressions. British Museum. 

 '■>■ 10. „ Llanyollensis, Dav. Interior of the dorsal and ventral valves, belonging to the same 



specimen recently found by Mr. D. C. Davies, of Oswestry, 

 in the Carboniferous limestone of Llangollen, Denbighshire ; 

 9 represents the ventral valve, and shows the small area, 

 teeth, adductor (b and c), as well as the cardinal or divari- 

 cator impressions (it). Fig. 10 represents the dorsal valve, 

 and shows the cardinal process, adductor impressions (a)' 

 reniform markings (x), and the eminences (z). This is the 

 only specimen hitherto discovered of the interior of the dorsal 

 valve. 



11. „ Martini, Sow. A very remarkable specimen, showing a peculiar shape and modifica- 



tion of striation near the margin. From the Carboniferous limestone 

 of Wetton, Staffordshire. 



12. Chonet.es Buchiana, De Koninck. A small variety, recently found in great abundance by 



Mr. W. W. Stoddart in the Carboniferous limestone near 

 Bristol. Some of the specimens are perfectly preserved, 

 and show that the entire surface of the valves were orna- 

 mented with minute, contiguous, concentric striae, and we 

 may also observe along the surface of the ribs the basis of 

 numerous spines. 



13. ,, concentrica, De Koninck 1 Impression of the exterior of one of the valves, from 



the Carboniferous limestone of Clatteringwell quarry, 

 Bishop's Hill, Kenness Wood, Kinross, Scotland. 

 Museum of Practical Geology. 



14. 15. Spirifera Carlukiensis, Dav. A large variety, recently discovered by Mr. S. Carringtou in the 



Carboniferous limestone of Narrowdale, near Wetton, in Staf- 

 fordshire, in which locality it occurs by myriads. 

 16. Chonetcs 1 From a bed of lower Permian limestone at Hartley quarry, Sunder- 



land, Durham, recently discovered by Mr. Kirkby. It is impos- 

 sible, from the state in which the shell is found, to decide whether 

 it belongs to C. Bavidsoni, Schauroth, or to C. Hardrensis. 



