INDEX TO GENERA AND SUBGENERA OF MOLLUSCA. 



Mathildia, 36, 115. 



Mayeria, 46. 



Medoriopbis. 34. 



Mega/omastoma, see Dissostoma, Me- 



galomatostoma 

 Megalomatostoma, 30, in. 

 Megaspira, 57. 

 Megat3'loma, 22. 

 Melamptis, see Auricula. 

 Melanatria, 34. 

 Melania, 34. 



Melania, see Bayania, Diastoma, Faunus 

 Melanoides, 34. 

 Melanopsis, 34. 

 Melanopsis, see Faunus. 

 Mellevilleia, 38. 

 Melongena, 46. 

 Menetus, 55. 

 Mercenaria, 6. 

 Meretrix, 6, 62. 

 Mesalia, 35. 



Mesostoma, see Cerithioderma. 

 Metulepsi\ see Ogivia. 

 Metula, 45, 115. 

 Micrelasma, 56, 113. 

 Micreschara, 29, no. 

 Mici'omphalina, 29. 

 Microtaphrus, 32. 

 Miltha, 10. 

 Miodon, 14. 

 Mitra, 47, 66, 115. 

 Mitra^ see Ptychatractus. 

 Mitreola, 47. 

 Mitrularia, 30. 

 Modiola. 17, 63, 1 14. 

 Modiola, see Arcoperna, Lithodomus, 



Modiolaria. 

 Modiolaica, 8. 

 Modiolarca, see Basterolia. 

 Modiolaria, 17, 63. 

 Mcera^ see Moerella, and 114. 

 Mccrella, 4, in. 

 Monilea, 22. 

 Monocirsus, 43. 

 Monodonta, 22, 

 Montacuta, 13, 114. 

 Morio, 43, 66. 

 Murchisoniella, 25. 

 Murex, 43, 66. 

 Murex^ see Clavilithes, Cryptoconus, 



Fusus, Melongena, Strepsidura, Sy- 



cum. 

 Miiricites, see Melanatria. 

 Muricidea, 43. 

 Muricopsis, 44. 

 Myristica, 46. 

 Mya, see Montacuta. 

 Mysia, 10, 62. 

 Mytilus, 16, 63. 

 Mytilus, see Arcoperna. 



IVacella, see Acroria. 



Nanina^ see Ariophanta. 



Nassa, 66. 



Narica, 29. 



Natica, 16, 64. 



Matica^ see Ampullina. 



Naticina, 28. 



Naticina^ see Eunaticina. 



Nautilus, 59. 



New7-a, see Cuspidaria. 



Neosroporomya, 3. 



Nernatura, see Bithinella, Stenothyra. 



Nemocardium, 9. 



Nerita, 24, 64. 



Nerita, see Velates. 



Neritina, 24, 64. 



Neritopsis, 24, 64. 



Neverita, 28. 



Niso, 26. 



Norrisella, 22. 



Norrisia, 22, 114. 



Nucinella, 15. 



Nucula, 15, 63. 



Nuculana, 15, 63. 



Nystia, 32. 



Obba, 57. 



Odontostoma, 24. 



Odontostomia, 25, 64. 



Odostomia, see Odontostomia, Syr- 



nola. 

 Ogivia, 39, 112. 

 Olwa, see Olivella. 

 Olivella, 49, 66. 

 Olivia, see Danilia. 

 Oiigotoma, see Asthenotoma. 

 Onushis, see Haliphoebus. 

 Op/iicardelus, see Leuconia. 

 Orhs, see Discohelix. 

 Orcula, 57. 

 Orina, 24. 

 Orthochetus, 40. 

 Orthochilus, 37. 

 Orf/wsioma, see Liocarenus. 

 Ostrea, 19, 63. 

 Otaulax, 23. 

 Oudardia, 5. 

 Ovula, 42. 

 Ovu/a, see Gisortia. 

 Oxyacrum, 52. 



Paliidestrina, see Hydrobia, Tomichia, 



Stenothyra. 

 Palndina. see Assiminea, Stenothyra, 



Tomichia, Viviparus. 

 Paludinella, see Bithinella. 

 Paludomus, 34, 115. 

 Pandora, 3. 



PanopCEa, see Glycymeris. 

 Papyridea, 9. 



