PLATE XXXII. 



CARBONIFEROUS SPECIES. 



Fig. 



1 . Productus sub-lsevis ? These are Prof, de Koninck's figures of P. 



Christiani, but which appear to me only a slightly 

 modified condition of P. sub-lavis ? Carboniferous 

 limestone, England (the exact locality is not given, 

 but was, perhaps, Clitheroe, in Lancashire.) 



2. ,, costatus, Sow. A specimen, with its spines, from Carboniferous 



shales near Glasgow. 



3. ,, ,, From Richmond, Yorkshire. Collection of Mr. S. Wood. 



4. „ ,, From the limestone of Settle, in Yorkshire. 



5,6,7. „ „ Three different specimens from Richmond, in Yorkshire, 



and Lesmahago, Lanarkshire, Scotland. 



8. „ „ Interior of the dorsal valve, from Scotland, and collection 



of Mr. J. Thomson. 



9. „ ,, A very fine, ribbed specimen, forming a passage into the 



variety P. muricatm, from Howood, Renfrewshire, 

 Scotland, and collection of Mr. J. Thomson. 



10,11. „ muricatus, Phillips. Fig. 1 is taken from the figure in the 'Geology 



of Yorkshire/ 11 from the original specimen 

 found at Harelaw, and now in the York 

 Museum. 



1 2. „ ,, From the limestone of Gateside, near Beith, in Ayrshire. 



13. ,, ,, From Corrieburn, Stirlingshire, and collection of Mr. J. 



Young. 



14. „ „ Another example from the same locality, enlarged. 



