PLATE 21 
All figures approximately natural size 
Fig. la. Paphia staminea (Conrad). Longitude 56 mm. Interior 
of left valve. 
Fig. 1b. Paphia staminea (Conrad). Longitude 56 mm. Ex- 
terior of left valve. : 
Fig. 2. Saxidomus nuttalli Conrad. Longitude 111.6 mm, Pigeon 
Point. Exterior of left valve. 
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