PLATE LXXI. 



PAGE 



Fig. 1. Spisula (Hemimactra?) chesapeakensis n. sp 290 



1. Exterior of right valve. 3 miles north of Plum Point. X % 



Figs. 2, 3. Bnsis directus (Conrad) 291 



2. Interior of left valve. Yorktown, Va. 



3. Exterior of right valve. Same locality. 



Figs. 4-6. Ensis ensiformis Conrad 292 



4. Posterior portion of broken valve. St. Mary's River. 



5. Posterior portion of broken valve. Same locality. 



6. Interior of left valve. York River, Va. 



Figs. 7a, 7b. Psammobia gubernatokia n. sp 292 



7a. Interior of left valve. Jones Wharf. 

 7b. Exterior of same valve. 



Figs. 8, 9. AsAPHis centenaria (Conrad) 293 



8. Interior of left valve. Jones Wharf. 



9. Exterior of left valve. Same locality. 



