SYSTEMATIC INDEX. 9 



Pagea 



19. Anomia cylindrica. Lamellate Oval Scale-Oyster, 205, 232 



'20. Auoruia striolata. Striolate Oval Scale-Oyster, . 206, 233 



SECTION II. DIMYARIA, . 206,233 



FAMILY II. MYTILINA, . 206, 233 



5. MZTILUS 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. Angulate, . 206, 236 



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



C. MODIOLA. MODIOLE, .... 206,236 



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



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



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



7. PINNA. FAN-MUSSEL, .... 206, 2?Q 



25. Pinna iugens. G reat Fan-Mussel, . . 206,240 



FAMILY III. UNIONINA, . 207, 240 



8. ANODON. MUD-MUSSEL, . , , . 207,241 



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



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



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



FAMILY IV. ARCINA, . 207, 243 



10. PECTUNCULUS. PECTUNCLE, . , . 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. Xucula rostrata. Beaked Nucule, . . 208,244 



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



FAMILY V. CYCLADINA, . 208, 245 



1-2. CYCLAS. CYCLE, ..... 208, 246 



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



13. PlSIDIUM. PlSIDJLM, . 209,248 



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



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

 56. 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. VENERIXA, . 210,254 



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



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



41. Lucina spinii'era. Spinous Lucina, . . 210, 255 



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



43. Lucina leucoma. White Lucina, . . 210, 256 



15. CYFBINA. CFPBIJU, , 210,256 



