PLATE LIII. 



CARBONIFEROUS SPECIES. 



{Supplementary illustrations?) 



Fig. 

 1, 2. RhyncJionella Carrinytoniana, Dav. Carboniferous limestone ; Wetton, Staf- 

 fordshire. 



3. Streptorhynchus crenistria, Phillips. Interior of the dorsal valve from Malham 



Moor, in Yorkshire, showing in a beauti- 

 ful manner the muscular impressions : 

 a', posterior adductor or occlusor ; a, 

 anterior adductor or occlusor. 



4. Productus striatus, Fischer. A very large example from Wetton, in Stafford- 



shire, and collection of Mr. Carrington. 



5. 6. „ undi/erus, De Koninck. Lower Scar limestone of Settle, in Yorkshire. 



5 a and 6 d enlarged. 



7. „ Koninckianus, De Verneuil. Settle. V' '• enlarged. 



8. „ maryinalis, De Koninck. Settle. S d ' enlarged. 



9. „ Nystianus, De Koninck. Settle. 9 C and 9 d - enlarged. 



10. „ aculeatus, Martin. With its spines preserved. From the Carboni- 



ferous shales, near Settle. Enlarged. 



11,12. „ Beshayesianus, De Koninck. ? Fig. 12, Professor Koninck's origi- 



nal specimen. 11"' enlarged. Settle, 

 Yorkshire. 



