PLATE XLIV. 



CARBONIFEROUS SPECIES. 



Fig. 



1. Productus semireticulatus, Martin. Interior of the dorsal valve, from the Carbo- 



niferous shales of Calderside, E. Kilbride, Scotland. 



2. ,, ,, Enlarged fragment of another specimen, from Redesdale, 



Northumberland. 



3. „ „ Fragments (enlarged) to show the cardinal process, as seen 



from the exterior of dorsal valve. 



4. ,, „ Interior of the ventral valve, from Calderside, E. Kil- 



bride, Lanarkshire, Scotland. Beautifully preserved in- 

 teriors of both valves occur in a shale near Settle, in 

 Yorkshire. 



5. „ margaritaceus, Phillips. From the Carboniferous limestone of Settle, 



in Yorkshire. 



6. ,, ,, The typical specimen, from Florence Court, and collection 



of Prof. Phillips. 



7. ,, „ A young shell, irom Settle. 



8. ,, ,, Phillips's P. pectinoides. Carboniferous limestone, Bol- 



land, Yorkshire, 



9. „ punctatus, Martin. From the Carboniferous limestone of Wensley- 



dale, Yorkshire. 



10. „ „ From the limestone of Ayrshire, Scotland. 10* Spiny 



surface, enlarged. 



11. ,, „ From Settle, Yorkshire. 



12. „ ,, A very elongated example, from the limestone of West 



Broadstone, Ayrshire, Scotland. 



13. ,, ,, A young shell, from Bolland. 



14. „ „ An oval variation, from Wensleydale, Yorkshire. 



15. „ ,, var. elegans, M'Coy. Carboniferous shales of Craigen- 



glen, Stirlingshire. 



16. „ „ Interior of the dorsal valve, from shales near Settle, 



Yorkshire. 



17. „ „ Internal cast of the ventral valve, as seen from the beak. 



18. „ fimbricatus? var. laciniatas, M'Coy. From the Carboniferous lime- 



stone of Kendal, in Westmoreland. 



