PLATE XXXIII. 



CARBONIFEROUS SPKCIES. 



Fig. 



1 to 4. Productus proboscideus, Be Verneuil. Carboniferous limestone, Settle, 



Yorkshire. I avail myself of 

 the present opportunity to 

 thank my zealous friend, Mr- 

 Burrow, for the liberal and 

 generous manner with which 

 he has presented me with his 

 best and, by mc, figured speci- 

 mens of Prodifcta. 



5. M ermineus, Be Koninck. Carboniferous limestone, Settle, York- 



shire. 



6, 7. „ Wrightii. Dew. Carboniferous limestone, Middleton, near Cork, 



Ireland. Fig. 6 in the collection of Mr. J. 

 Wright, of Cork. 



8,9. „ sinuatus, Br Koninck. Fig. 8, nat. size; 8"> h ' c enlarged. 9. 



Enlarged view of the ventral valve, as 

 seen from the beak, to show the 

 position of the cardinal spines, &c. 

 Carboniferous limestone, Settle, York- 

 shire. 



10, 11. „ „ Internal casts of both valves, showing the position of 



the adductor (a) and divaricator (r) muscular impres- 

 sions, as well as the reniform impressions (z). 



12. „ fimbriatus, Soto. Ventral valve, with its spines. Carboniferous 



limestone, Settle, Yorkshire. 



13,14. „ ,, Two examples deprived of their spines, from the same 



locality. 



15. „ „ 15", interior of the dorsal valve • 15 c , the same, viewed in 



profile; 15 s , the same specimen, seen from the exterior, 

 andshowing how the short spines are arranged in regu- 

 lar rows. Carboniferous shales, near Settle,Yorkshire. 



16. „ aculeatus, Martin. From the original example. 10*- A carefully 



enlarged illustration. Sowerby's col- 

 lection, British Museum. 



