Mercenaria Schmch. 
Meretrix Lmck. 
Mesodesma Desh. 
Microcondylæa West. 
Mitra Lmck. 
Mitrolumna Bucq. et Dautz 
Modiola Lmck. 
Modiolarca Gray. 
Modiolarcidæ . 
Moitessieria Brgt. 
Mollusques fluviatiles . 
Mollusques marins. 
Mollusques terrestres. . 
Monoceros Lmck. 
Monodonta Gmel.. 
Montacuta Turt. 
Murex Lin.. 
Muricidæ . 
Muricinæ . 
Mutela Scop. 
Mutelidæ . 
Mya Lin. 
Myidæ . 
Mytilicardia Blvll. 
Mytilidæ . 
Mytilinæ . 
Mytilus Lin. 
Nacella Schmch. 
Nanina Gray. 
Nassa Lmck. 
Natica Adans. 
Naticidær ...... 
Naticina Gray. 
Nautilidæ . 
Nautilus Lin. 
Navicella Lmck. 
Neæra Gray. 
Neothauma Smth. 
Neptunea Boit. 
Nerita Lin. 
Neritidæ . 37 
Neritina Lmck. 
Neritopsidæ . 
Neritopsis Grtlp. 
Nucula Lmck. 186 
Nuculidæ . 186 
Obeliscus Humph. 93 
Odostomia Flmg. 95 
Oleaçina Boit. 1 
Oliva Brug. 75 
Olivancillaria Orb. 75 
Olividæ . 75 
Omphalius Philippi. 132 
Oniscia Sow. 87 
Onustidæ . 123 
Orthalicidæ . 26 
Orthalicus Bk. 26 
Ostrea Lin. 192 
Ostreidæ . 192 
OtopomaGray. 29 
Ovula Brug. 109 
Oxystele Philippi. 132 
Pachypoma Gray. 128 
Padollus Mft. 135 
Paladilhia Brgt. 34 
PaludomusSw. 31 
Pandora Brug. 153 
Paphia Boit... 161 
Paphiinæ . 161 
Papyridea Sow. 171 
Parmophorus Blvll. 136 
Patella Lin. 138 
Patellidæ . 138 
Patelloidea Quoy. 137 
Pecten Mtill. 187 
Pectinibranches . 31 
Pectinj-dæ . 187 
Pectunculina Orb. 186 
Pectunculus Lmck. 186 
Pedum Brug. 191 
Pélécypodes . 42 146 
Periploma Schmch. 152 
Perna Brug. 182 
Persona Mft. 67 
Petricola Lmck. 169 
Petricolinæ . 168 
Pharella Gray. 149 
Pharinæ . 149 
. 166 
162 
162 
49 
80 
81 
180 
181 
181 
34 
31 
55 
55 
73 
130 
176 
58 
58 
58 
51 
51 
150 
150 
177 
178 
179 
178 
139 
3 
69 
89 
89 
91 
55 
55 
126 
153 
35 
61 
1 26 
:26 
37 
125 
125 
