PLATE XLI. 



CARBONIFEROUS SPECIES. 



Fig. 



1. Productus pustnlosus, VhilHps. The original specimen, from the mountain lime- 



stone of Holland. Gilbertson's collection. 

 British Museum. 



2. ,, ,, A very large example, from the Carboniferous limestone 



of Derbyshire. Museum of Practical Geology. 



3. „ „ From the Carboniferous limestone of Craven. Collection 



of Mr. E. Wood, 



4. ,, „ Interior of the dorsal valve, from the Carboniferous lime- 



stone of Yorkshire. 



5. ,, ,, Internal cast of the ventral valve, seen from the umbonal 



portion. Shores of Lough Gill, County Sligo. Museum 

 of the Geological Society. 



0. ,, ,, This is the P. rugata of Phillips, not well represented in 



the ' Geology of Yorkshire.' Holland. 



