INDEX TO THE GENERA. 



Page. 



Aehatina, 38 



Acme, 41 



Actseon, 29 



Amphidesma, v. Syndosmya. 



Amphisphyra, 28 



Anacina, 97 



Ancula, 18 



Ancylus, 44 



Anodon, 82 



Anomia, 75 



Aplidium, 109 



Aplysia, 24 



Aporrhais, 61 



Area, 79 



Arion, 29 



Artemis, 84 



Aseidia, 105 



Astarte, 86 



Auricula v. Conovulus. 



Azeca, 38 



Balaja, 39 



Bitliinia, 45 



Botrylloides, 112 



Botryllus, 110 



Buceinum, 66 



Bulimus 38 



Bulla, 27 



Bullffia, 24 



Cfficum, 74 



Capulus, 71 



Cardium, 83 



Caryehium, 41 



Cerithiuni, 60 



Chemnitzia, 48 



Chiton, 72 



Clausilia, 39 



Clavellina, 108 



Conovulus, 41 



Corbula, 96 



Coriocella, v. Laraellaria. 



Crenella, 82 



Cryptodon, 91 



Cyelas, 92 



Cynthia, 101 



Cypraea, 67 



Cyprina, 86 



Dendronotus, 19 



Dentalium, 74 



Donax, 87 



Doris, 15 



Doto, 20 



Eledone, 13 



Emargiuula,* 70 



Eolis, 20 



Euliraa, 46 



Fusus, 62 



Page. 



Goniodoris, 17 



Helix, 33 



Idalia, 18 



Kellia, 93 



Lacuna, 57 



Lamellaria, 70 



Leda, 79 



Leptoclinum, HO 



Lepton, 93 



Lima, 78 



Limapontia 23 



Limax, 31 



Limnsea, 42 



Littorina, 55 



Loligo, 14 



Lottia, 72 



Lucina, 91 



Lutraria, 98 



Lyonsia 98 



Mactra, 90 



Margarita, 60 



Modiola, 81 



Molgula, 103 



Montacuta, 95 



Murex, 66 



Mya, 98 



Mytilus, 80 



Nassa, 67 



Natica, 68 



Nea?ra, 96 



Neritina, 60 



Nucula, 79 



Octopus, V. Eledone. 



Odostoniia, 50 



Ostrea, 76 



Paludina, v. Bithinia. 



Panopasa, 99 



Patella, 71 



Pecten, 76 



Peetunculus, 78 



Pelonaia, 101 



Pliolas, 100 



Physa, 43 



Pisidium, 92 



Planorbis, 43 



Pleurobranchus, 24 



Pleurotoma, 61 



Polyccra, 17 



Polyclinuui, 109 



Psammobia, 89 



Pullastra, 86 



Puneturella, 70 



Pupa, 39 



Purpura, 66 



Rissoa, 53 



Saxicava, 100 



