144 



NEW YORK STATE MUSEUM 

 PLATE 3 



FIG. 



I, 2 



4, 5 



Monomerella noveboracum sp. nov. 



(See plate 2 and plate 4, fig. 38) 

 Page 39 



Two views of the cardinal region of the brachial valve, show- 

 ing the hinge line and the strongly developed crescent. 

 From a gutta-percha squeeze of a natural impression 



An internal cast of a brachial valve, with the muscular impres- 

 sions of the platform strongly defined, showing the short 

 platform vaults 



The interior of a large brachial valve, shown as a natural 

 cast (fig. 5) and as a gutta-percha squeeze taken from this 

 cast (fig. 4). These show well the broad form of the valve, 

 the muscular impressions, the form of the platform and the 

 anterior septum. 



