EXPLANATION OF PLATE 60 

 All figures approximately natural size 

 Fig. 1. Mulinia pabloensis Packard. Left valve. Longitude, 81 mm. 

 Fig. 2. Mulinia pabloensis Packard. A small specimen of left valve. 

 Fig. 3. Mya (Cryptomya) ovalis Conrad. Bight valve. Longitude, 15 mm. 

 Fig. 4. Mya (Cryptomya) ovalis Conrad. Eight valve. Longitude, 10 mm. 

 Fig." 5. Mulinia densata Conrad. Left valve. Longitude, 53 mm. 

 Fig. 6. Petricola buwaldi, n. sp. Eight valve. 



Fig. 7. Mulinia pabloensis Packard. Eight valve. Longitude, 53 mm. 



Fig. 8. Spisula albaria Conrad. Left valve. Longitude, 51 mm. 



Fig. 9. Mactra trampasensis Packard. Eight valve. Longitude, 36 mm. 



[550] 



