28 Bulletin 24 66 



PLATE 2 (9- 



Page 



Fig. 1. Modiolus gigatltoides, n. sp 13 51 



View showing left valve of type specimen, nearly 

 nat. size. 



2. Ventral view of same specimen. 



3. A fragmentary specimen showing characters of the 



dorsal area. 



4. Bornia virginiana, n. sp 17 55 



Exterior view of right valve, enlarged about 4 

 times, type. 



5. Lithophaga yorkensis, n. sp 13 5| 



Right valve of type, enlarged about twice. 



6. Left valve of type specimen. " 



7. Typhis harrisi, n. sp 8 46 



Ventral view of type, enlarged about 1% times. 



8. Bornia virginiana, n. sp 17 55 



Inside view of type specimen. 



9. Typhis harrisi, n. sp 8 46 



Dorsal view of type specimen. 



10. Lithophaga yorkensis, n. sp 13 51 



Co-type, showing a portion of the calcareous deposit 

 surrounding the shell. 



