PLATE XXXIV. 



Fig. 103. Ostiiea Idriaensis. Natural size. 



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

 Fl S- 104 - Ostrea appressa. Natural size. 



104 a. Hinge. 



Fig. 105. Rhynchonella Whitneyi. Natural size. 



105 «. Side view. 



105 b. Outline of the ribs. 



Fig;- 106.. i Smilotrochus curtus. Top view. 



106 a. Longitudinal section. 



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203 



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20c 



