12 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 66 



9. Corbivitla (Cyanocyclas) exquisita, new species. Dorsal view. 



10. Corbicula (Cyanocyclas) exquisita, new species. Exterior of left valve. 



11. Corbicula (Cyanocyclas) felipponei, new species. Exterior of left 



valve. 



12. Corbicula (Cyanocyclas) exquisita, new species. Interior of left valve. 



Plate 2. 



Fig. 1. Corbicula (Cyanocyclas) circularis, new species. Exterior of left valve. 



2. Corbicula (Cyanocyclas) circularis, new species. Interior of left valve. 



3. Corbicula (Cyanocyclas) circularis, new species. Dorsal view of left 



valve. 



4. Corbicula (Cyanocyclas) (ieZicaia, new species. Exterior of left valve. 



5. Corbicula (Cyanocyclas) delicata. new species. Dorsal view. 



6. Corbicula (Cyanocyclas) delicata, new species. Interior of left valve. 



7. Corbicula (Cyanocyclas) fortis, new species. Exterior of left valve. 



8. Corbicula (Cyanocyclas) fortis, new species. Dorsal view. 



9. Corbicula (Cyanocyclas) fortis, new species. Interior of left valve. 



10. Corbicula (Cyanocyclas) compacta, new species. Exterior of left valve. 



11. Corbicula (Cyanocyclas) compacta, new species. Dorsal view. 



12. Corbicula (Cyanocyclas) compacta. new species. Interior of left valve. 



o 



