PLATE XLVII 



PAGE 



Figs. 1-5. TEREBKATTJLA HARLANI Morton 734 



1. Exterior of dorsal valve. 



2. Interior of ventral valve. 



3. Exterior of same. 



4. Ventral view of complete individual. 



5. Dorsal view of same. 



Rancocas formation, Noxontown Pond, Delaware. 



Figs. 6-10. CARDIASTER MARYLANDICA Clark n. sp 750 



6. Oral view. 



7. Aboral view of same. 



8. Aboral view of another specimen. 



9. Oral view of same. 

 10. Lateral view of same. 



Monmouth formation, Brightseat, Prince George's County. 



Figs. 11-14. HEMIASTER DELAWARENSIS Clark n. sp 751 



11. Aboral view. 



12. Lateral view of same. 



13. Oral view of same. 



14. Posterior view of same. 



Matawan formation, south side of Chesapeake and Delaware 

 Canal, between Lorewood Grove and St. Georges, Delaware. 



Fig. 15. SERPULA TRIGONALIS Gardner n. sp 746 



Type X 2. 



Rancocas formation, Noxontown Pond, Delaware. 



Figs. 16-19. ORNATAPORTA MARYLANDICA Gardner n. gen. et sp 748 



16. Lateral view of tube. 



17. Operculum of same. X 4. 



18. Operculum of another specimen. X 4. 



19. Several radials. X 20. 



Monmouth formation, Brooks' Estate near Seat Pleasant, 

 Prince George's County. 



943 



