PLATE XXXIV 



PAGE 



Fig. 103. OSTREA IDRIAENSIS. Natural size. 203 



103 a. Hinge of lower valve from a very large specimen. 



Fig. 104. OSTREA APPRESSA. Natural size. 203 



104 a. Hinge. 



Fig. 105. KHYNCHONELLA WHITNEYI. Natural size. 204 



105 a. Side view. 



105 b. Outline of the ribs. 



Fig. 106. ? SMILOTROCHUS CTTRTUS. Top view. 205 



106 a. Longitudinal section. 



