NEWBERRIA, Hatt. 
Page 851. 
NEWBERRIA JoHANNIS, Hall. 
Figs. 12, 18. Opposite sides of a large and characteristic specimen; showing the 
elongate-oval form and the decided median angulation of the valves. 
Fig. 14. An internal cast of the upper portion of the brachial valve; showing 
the impression of the divided hinge-plate and the adductor scar. 
Fig. 17. An internal cast of a similar portion of the pedicle-valve. 
Hamilton group. Waterloo, Iowa. 
Newserria Criaypou, Hall. 
Fig. 15. An internal cast of a portion of the pedicle-valve; showing the diver- 
gent impressions of the dental lamellee, the irregularly divided scar 
of the adductor muscles, the narrow anterior adductor and strong 
vascular impressions. 
Fig. 16. A portion of the interior of the brachial valve, drawn from a gutta- 
percha impression of a natural internal cast; showing the division 
of the hinge-plate, and the striated adductor impressions. 
Fig. 18. The interior of a pedicle-valve, from a gutta-percha impression; show- 
ing an open delthyrium, the divergent dental plates, the muscular 
and vascular impressions. 
Fig. 19. An internal cast of the pedicle-valve; showing the impression of the 
apical cup-shaped depression of the pedicle-valve. By the removal 
of the filling of the dental sockets, the cardinal slope, is made to 
appear unusually large and flat. 
Sandstones of the Hamilton group. Perry county, Pennsylvania. 
127 261 
