SYSTEMATIC INDEX. 



Pages 



19. Anoraia cylindrica. Lamellate Oval Scale-Oyster, 205, 32 



20. Aiioinia striolata. Striolate Oval Scale-Oyster, . 206, 233 



SECTION II. DIMYARIA, . 206,233 



FAMILY II. MYTILINA, . 206, 233 



-5. MYTILUS MUSSEL, .... 206,234 



21. Mytilus edulis. Eatable or Common Mussel, . 206, 234 



A. M. edulis vulgaris. Common, . . 206, 235 



B. M. edulis pellucidus. Thin-Shelled, . 206, 235 



C. M. edulis incurvatus. Incurved, . 206, 235 



D. M. edulis angulatus. Aiigulate, . 206, 236 



E. M. edulis pusillus. Dwarf, 206,236 



6. MODIOLA. MODIOLE, .... 206, 236 



22. Modiola barbata. Great Modiole. Horse Mussel, 206, 237 



23. Modiola discrepans. Compressed Ribbed Modiole, 206, 238 



24. Modiola diseors. Tumid Ribbed Modiole, . 206, 23? 



7. PINNA. FAN-MUSSEL, .... 206, 239 



25. Pinna ingens. Great Fan-Mussel, . . 206, 240 



FAMILY III. UNIONINA, . 207, 240 



8. ANODON. Mu-Mus&EL, .... 207, 241 



26. Anodon anatinus. Duck Mud-Mussel, . 207, 241 



9. ALASMODON. PEARL-MUSSEL, . . . 207, 242 



27. Alasmodon margaritiferus. Oblong Pearl-Mussel, 207, 242 



FAMILY IV. ARCINA, . 207, 243 



10. PECTUNCULUS. PECTUXCLE, . . . 337 



28. Pectunculus Glycimeris. Ribbed Pectuncle, . 338 



11. XUCULA. NUCULE, .... 207,243 



29. Nucula Nucleus. Common or Pearly Nucule, . 208, 243 



30. Nucula tenuis. Thin Nucule, . . 208, 244 



31. Nucula rostrata. Beaked Nucule, . . 208, 244 



32. Nucula minuta. Minute Nucule, . . 208, 245 



FAMILY V. CYCLADINA, . 208, 245 



12. CYCJLAS. CYCLE, ..... 208,246 



33. Cyclas flavescens. Yellowish Cycle, . . 208, 246 



13. PISJDIUM. PISIDICM, .... 209,248 



34. Pisidium Joannis. John's Pisidium, . . 209, 248 



35. Pisidium Jenynsii. Jenyns's Pisidium, . 209, 249 



36. Pisidium pulchellum. Beautiful Pisidium, . 209, 252 



37. Pisidium nitidum. Shining Pisidium, . . 209, 253 



38. Pisidium pusillum. Dwarf Pisidium, . 209, 253 



39. Pisidium amnicum. River Pisidium, . 338 



FAMILY VI. VENERINA, . 210, 254 



14. LUCIXA. LUCINA, ..... 210, 254 



40. Lucina Radula. Wrinkled Lucina, . . 210, 255 



41. Lucina spinifera. Spinous Lucina, . . 210, 255 



42. Lucina lactea. Milk-white Lucina, . . 210, 255 



43. Lucina It-ucoma. "White Lucina, . . 210, 256 

 J5- CYPBINA. CTPRIWA, .... 210, 250 



