PLATE XXXIX 



PAGE 



Figs. 1-4. CRASSATELLITES VADOSUS (Morton) Johnson 649 



1. Exterior of left valve. 



2. Interior of same. 



3. Exterior of left valve. 



4. Anterior view of double valves. 



Monmouth formation, Brightseat, Prince George's County. 



Fig. 5. CRASSATELLITES PTEROPSIS (Conrad) 655 



Exterior of right valve. Monmouth formation, near Oakland, Prince 

 George's County, U. S. National Museum. 



Figs. 6, 7. CRASSATELLITES LINTEUS (Conrad) Johnson 653 



6. Interior of right valve. 



7. Exterior of same. 



Monmouth formation, Brightseat, Prince George's County. 



Figs. 8, 9. PHACOIDES NOXONTOWXENSIS Gardner n. sp 660 



8. Cast of left valve. 



9. Squeeze of mold of external sculpture. 



Manasquan formation, Noxontown Mill Pond, Delaware. 



Figs. 10, 11. MYRT^A STEPHENSONI Gardner n. sp 659 



10. Interior of left valve. X 4. 



11. Exterior of same. X 4. 



Monmcuth formation, 1 mile west of Friendly, Prince George's 

 County. 



936 



