EXPLANATION OF PLATES 215 



Eurychilina bulbifera sp. nov. 

 p. 76 



Fig. 



14-16 Ventral view, cross-sectioii and lateral view of an entire 

 left valve, x 22 • 



17 A ^rnall right valve, x 22 

 Pe^bbles of groups 6 and 7 



Eurychilina (?) solida sp. nov. 



p. 77 



18 Only valve found, x 22 



Pebble of group 7 



Leperditia fabulites Conrad sp. 

 p. 70 



19 A right valve. Natural size 



20 Enlargement of ventral border of same, x 10 

 Pebble of group 7 



Leperditia resplendens sp. nov. 

 p. 71 



21-23 Anterior, lateral and ventral views of a perfect right valve. 

 X 17 



24 Another right valve having the entire surface pitted, x 17 



25 A valve in which only the ventral part shows a somewhat 



coarse pitting, x 17 

 26, 27 Lateral and posterior views of a valve which has the ven- 

 tral region pitted, x 17 

 Pebbles of groups 6 and 7 



