SYSTEMATIC INDEX. 



19. Anomia cylindrica. Lamellate Oval Scale-Oyster, 



20. Anomia striulata. Striolate Oval Scale-Oyster, 



SECTION II. DIMYARIA, 



FAMILY II. MYTILINA, 



5. Mytilus Mussel, 



21. Mytilus edulis. Eatable or Common Mussel, 



A. M. edulis vulgaris. Common, . 



B. M. edulis pellucidus. Thin-Shelled, 



C. M. edulis incurvatus. Incurved, 



D. M. edulis angulatus. Angulate, 



E. M. edulis pusillus. Dwarf, 



6. MODIOLA. MODIOLE, 



22. Modiola barbata. Great Modiole. Horse Mussel, 



23. Modiola dis.-repans. Compressed Eibbed Modiole, 



24. Modiola discors. Tumid Eibbed Modiole, 



7. Pixxa. Fax-Mussel, .... 



25. Pinna ingens. Great Fan-Mussel, 



FAMILY III. UNIONINA, 



8. Anodox. Mud-Mussel, .... 



26. Anodon auatinus. Duck Mud-Mussel, 

 3. Alasmodon-. Peael-Mussel, 



27. Alasmodon margaritiferus. Oblong Pearl-Mussel, 



FAMILY IY. ABCINA, 



10. Pectuxculus. Pectuxclk, 



28. Peetunculus Glycimeris. Eibbed Pectuncle, 



11. Nucula. Nucule, 



29. Nucula Nucleus. Common or Pearly Nucule, 



30. Nucula tenuis. Thin Nucule, 



31. Nucula rostrata. E-eaktd Nucule, 



32. Nucula minuta. Minute Nucule, 



FAMILY V. CYCLADINA, 

 1'2. Cyclas. Cycle, .... 



33. Cyclas flavescens. Yellowish Cycle, 



13. PlSIDIUM. PlSIDICM, 



34. Pisidium Joannis. John's Pisidium, 



35. Pisidium Jenynsii. Jenyns's Pisidium, 



36. Pisidium pulchellum. Beautiful Pisidium, 



37. Pisidium nitidum. Shining Pisidium, . 



38. Pisidium pusiUum. Dwarf Pisidium, 



39. Pisidium amnicum. Eiver Pisidium, 



FAMILY VI. YENEEINA, 



14. Luuina. Lucixa. . 



40. Lucina Eadula. "Wrinkled Lucina, 



41. Lucina spinifera. Spinous Lucina, 



42. Lucina lactea. Milk-white Lucina, 



43. Lucina leucoma. White Lucina, 



15. Ctpbixa. Cypbina, 



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