EXPLANATION OF PLATE 64 



All figures approximately natural size 



Pig. 1. Mya (Platydon) cancellatus (Conrad). Eight valve. Longitude, 

 59 mm. 



Pig. 2. Metis alta Conrad. Left valve. Longitude, 45 mm. 



Pig. 3. Pecten bilineatus, n. sp. Eight valve. Longitude, 46 mm. 



Fig. 4. Pecten bilineatus, n. sp. Left valve. Longitude, 36 mm. 



• Pig. 5. Dosinia arnoldi, n. sp. Cast of left valve, showing characteristic 

 ridge radiating from umbone toward ventral edge. Longitude, 82 mm. 



[558] 



