142 



NEW YORK STATE MUSEUM 

 PLATE 2 



Monomerella noveboracum sp. nov. 



(See plate 3 and plate 4, fig. 38) 

 Page 39 



IG. 



i Cardinal area of a pedicle valve, showing the coarse stria- 

 tions of the pedicle groove, the lateral slopes, the character 

 of the cardinal slope and cardinal groove, and the narrow 

 but high cardinal buttress 



2 A pedicle valve with very high and relatively narrow cardinal 



region and more depressed median area. From a gutta- 

 percha squeeze of the natural impression 



3 The exterior of the pedicle valve of an old individual with 



very irregular squamous surface. From a gutta-percha 

 squeeze of a natural impression ; slightly restored at the 

 anterior and posterior ends 



4 The exterior of a younger pedicle valve, showing the growth 



lines. Also from a gutta-percha impression 



