Fig. 
PLATE 16. 
Page 
1. Strophodonta concava. 96 
1 a. A ventral valve which is carinate along the centre. 
1 6. A dorsal view showing the area of both valves, etc. 
1 c. A profile of specimen fig. 1 b. 
1 d. A large ventral valve which is less convex than the usual forms and somewhat undulated 
or sub-plicated on the margin. 
1 e. The exterior of a dorsal valve, showing the extension of the cardinal process above the 
hinge line. 
If. The interior of the specimen fig. 1 e, showing the muscular impressions, cardinal process, 
crenulated hinge line, etc. 
1 g. A profile of the same, showing the geniculation in front, and the muscular scar. 
1 h. The interior of a ventral valve, showing the area and muscular impressions. 
