PLATE II. 



MONOMERELLA OVATA (page 5). 



Figure 1. Interior of a ventral or pedicle valve, partly restored. The 

 proportions of this restoration are not quite correct, the 

 cardinal facet being too broad and the platform too large as 

 well as placed too far forwards. Additional figures of better 

 specimens of this species and its variety are given on Plate 8. 



MONOMERELLA OVATA, VAR. LATA (page 6). 



Figure 2. Interior of the ventral or pedicle valve. 

 " 2a. Exterior of the same specimen. 



EHTNOBOLrs Galtensis (page 7). 



Figure la. Exterior of the ventral or pedicle valve. This species also is 

 further illustrated on Plate 8. 



GoNioPHORA CRAssA (page 8). 



Figure 3. Exterior of a left valve. 



" 3a. Exterior of a right valve. 



" 3b. Interior of a left valve. 



" 3c. Dorsal view of the closed valves, to show the concamerated 

 structure of the inside of the anterior end. 



Anodontopsis concinna (page 12). 



Figure 4. Exterior of a cast of a right valve. As this figure is not very 

 satisfactory, two additional illustrations are given on Plate?. 



Iltonia (?) cosTULATA (page 15)., 



Figure 5. Side view of a right valve, talien from a gutta-percha impression 

 of a mould of the exterior of the shell. 



