PLATE XLII. 



CARBONIFEROUS SPECIES. 



Fig. 



], 2. Productus pustulosis, Phillips. Prom the Carboniferous limestone of Kildare, 



in Ireland. 



3. „ ,, P. ovalis, Phillips, from the Carboniferous limestone of 



Bolland. 



4. ,, „ P. pyaddiformis, Dc Koninck, from the Carboniferous 



limestone of Yorkshire. 



; J- „ scabriculus, Martin. Prom the Carboniferous limestone of Carluke, 



Lanarkshire, Scotland. 



6. „ „ P. quincuncialis, Phillips. Carboniferous limestone of 



Yorkshire. 



7. „ „ A very large example from the Craven district, in York- 



shire, and collection of Mr. E. Wood. 



8. 8" ,, „ Interior of the dorsal valve, showing the curiously divided 



median ridge, from the Carboniferous shales of Lanark- 

 shire, Scotland. 

 9- ,, cora, VOrbigny. Prom a specimen showing the concentric 



wrinkles sometimes 'present in the dorsal valve. Derby- 

 shire ? 



