PLATE XIII. 

 Eadiolites davidsoni sp. nov. 



The illustrations^how an elongated specimen with details of its general 

 structure. In the rower right-hand corner is a figure showing the two 

 main sutures, which extend the entire length of the shell, but are not 

 seen in' the large illustration, hi the lower left-hand corner is an end 

 view of the specimen figured. The object in the upper right-hand por- 

 tion of this figure is a fragment of the broken upper valve. 



