EXPLANATION OF PLATE XIV. 



Fig. 1. ExoGYHA poudeiiosa. (Pago 172.) 



a. Exterior view of the larger valve ; less tbau average adiilt tizo. 



i. Interior view of tlie same. 



c. Longitudinal section of the same, showing thickness of test. 

 Fig. 2. Osthea pudoentia. (Page 171.) 



o. Exterior view, natural size, of the lower or more capacious valve, showing very small scar 

 of attachment. 



h. Exterior view of upper v.ilye of the same, showing small prominent beak. 



c. Interior view of upper valve. 



d. Interior view ot lower valve. 



