148 



Physical Geography. 



boniferous Limestone sea, from which more than 1 ,500 

 species have been named. It is to be remarked also. 



FIG. 31. 



Productus horridus. 



Fcnestella retiformis. 



Camerophoria Schlotheimi. Lingula Crcdneri. Strophalosia lamellosa. 



Palaeoniscus comptus. 

 Group of Permian Fossils. 



that all of the Permian shells are dwarfed in aspect, 

 when compared with their Carboniferous congeners. 



In this poverty in number, and dwarfing of the 

 forms, these Permian fossils may be compared with the 



