PLATE XLIII. 



CARBONIFEROUS SPECIES. 



Fig. 



1. Productus seraireticulatus Martin. From the Carboniferous limestone of Kildare. 



Y A large spine. 



2. „ „ A specimen agreeing with Phillips's P.puffilis, from the 



Carboniferous limestone of Stirlingshire. 



2" ,, ,, From the Carboniferous limestone of Nellfield, Lanark- 



shire. 



3. ' ,, „ Portion of a ventral valve, showing a long spine in situ. 



Limestone, Kildare, Ireland, and Museum of Practical 



Geology. 



4. ,, „ Profile of a specimen from Kildare. 



5. „ „ Portion of a specimen (enlarged), in which a small, 



but distinct, area and a pseudo-deltidium can be 

 perceived. Locality unknown, probably Derbyshire. 

 British Museum. 



G. ,, „ var. Martini, Sow. Carboniferous limestone, Settle, 



Yorkshire. 



7. „ „ „ From Park Hill, Longnor, Derby- 



shire, and Museum of Practical 

 Geology. 



8. „ „ „ Interior of dorsal valve, from 



shales near Settle, in Yorkshire. 



!). „ „ var. concinna, Sow. From the Carboniferous limestone of 



Campsie, Stirlingshire. 



10. „ „ „ A specimen of the same, to show 



how the shell becomes at times 

 fractured. 



