EXPLANATION OF PLATE XLV. 



Page 



Fi6 . 1 . Myalina recurvirostris 



la . loterlor of valve . 

 Ib. Exterior of same . 



Carboniferous, Upper Coal Measures. 



FIG. 2. Pinna per acuta 



2a. Side view. 

 2b. Dorsal aspect 



Carboniferous, Upper CDal Measures. 



FIG 8 . Nucula ventricosa 



3a. Inside view (enlarged) . 

 3b. Right valve. 



Carboniferous, Coal Measures. 



FIG. 4. Nuculana bellistriata 



4a. Left valve. 

 4b . Dorsal aspect . 



Carboniferous, Coal Measures . 



116 



121 



122 



