EXPLANAIION OF PLATE XLVIII. 



Page 



FIG. 1. Pleurotomaria broadheadi 144 



la. Type specimen. (Broadhead collection.) 

 Ib . Another view of same . 



Carboniferous, Upper Coal Measures. 



Pia. 2. Pleurotomaria brazoensis 142 



2a. View of a well-preserved specimen, x 2. (Keyes collection.) 

 2b. Another view of same. 



Carboniferous, Lower Coal Measures. 



FIG . 3 . Pleurotomaria missouriensis 186 



3a. Side view. (Hare collection ) 

 8b. Sutural region (enlarged). 



Carboniferous, Upper Coal Measures. 



FIG . 4 . Pleurotomaria sp 1 



4a. Side aspect. (Rowley collection.) 

 Carboniferous, Burlington limestone. 



FIG. 5. Pleurotomaria perhumerosa 140 



Side view of a typical specimen. 

 Carboniferous, Upper Coal Measures. 



FIG . 6 . Pleurotomaria turbiniformis 185 



6a . Side vi ew . ( H are collection . ) 

 6b. Ornamentation (enlarged). 



Carboniferous, Upper Coal Measures. 



