1889] maryland academy of sciences. 65 



Lamellibranchiata. 



1. Anomia Ruffini Con. Up. Marlboro. 



3. Ostrea compressirostra Say. Ravines and hills of the formation gen- 

 erally. 



3. 0. divaricata Lea. Charles Co. south of Mattawoman. 



4. 0. sp? Near Glymont. 



5. O. sp ? Near Smith's Point, Charles Co. 



6. Gryphostrea eversa Con. Up. Marlboro and Farmington. 



7. Pecteusp? Piscataway. 



8. Nuculana iraprocera Con. Up. Marlboro, Chase's creek, Piscataway. 



9. N. parva Rog. ClifEs of Severn river. 



10. N. protexta Con. Severn below Round Bay. 



11. Yoldiasp? Piscataway. 



12. Axinaea idonea Con. South river, and Annap. and Wash. R. R. near 



Annapolis. 



13. A. starainea Con. Up. Marlboro, Queen Anne village, around Annap- 



olis, etc. 



14. Byssoarca sp ? Piscataway. 



15. Liatiarca gigaiitea Con. Piscataway to Mattawoman. 



16. L. idonea Con. Piscataway, Up. Marlboro, Queen Anne. 



17. L. ononchela Rog. Piscataway. 



18. L. transversa Rog. Up. Marlboro and Annapolis. 



19. Limopsissp? Piscataway. 



20. Mytilus sp ? Piscataway, Queen Anne, etc. 



21. Crassatella alta Con. South river. Up. Marlboro, etc. 



22. C. alaeformis Con. Piscataway, Up. Marlboro, Queen Anne, etc. 



23. C. protexta Con. with var. capricranium and var. palmula. Piscata- 



way to southern part of Charles county, etc. 



24. Cardita sp ? Near Annapolis. 



25. Venericardia perantiqua Con. Piscataway. 



26. V. planicosta Lam. Generally distributed. 



27. Protocardia virginiana Con. Piscataway. 



28. Dosiniopsis Meekii Con. Generally distributed. 



29. Dione ovata Rogers. South of Round Bay, etc. 



30. Corbula oniscus Con. Piscataway. 



31. Corbula sp? Queen Anne. 



32. Periploraa claibornensis Lea. Piscataway. 



33. Pholadomya Marylandica Con. Piscataway, Up. Marlboro, Queen 



Anne. 



34. Glycimeris elongata Con. Piscataway, Up. Marlboro, Queen Anne, 



Annapolis, etc. 



35. Pholas petrosa Con. Up. Marlboro, Piscataway. 



Gasteropoda. 



36. Monodonta glandula Con. Annapolis, Up. Marlboro, Piscataway. 



37. Turritella Mortoni Con. Generally distributed. 



