AKT. 17 



ILLUSTRATIONS OF TYPES OF SHELLS DALL 



33 



INDEX TO GENERA 



Acila 



Acmaea 



Agathotoma 



Aligena 



A mphissa 



Anatina 



A ncislrolepis 



A nisos pira 



Anomalosipho 



Antiplanes 



Area 



Astraea 



Aulacofusus 



Basilissa 



Beringius 



Bolma 



Boreoscala 



Boreofrophon 



Borsonella 



B nccinitm 



Cadulus 



Calliostoma 



Chrysodomus 



Cirsotrema 



Cnesterium 



Cocculina 



Coins 



Coralliophila 



Corbicula 



Corbula 



Cosmioconcha 



Crenella 



Cryptomya 



Cumingia 



Cuspidaria 



Cyanocyclas 



Cymatium 



Cyrenodonax 



Dentalium 



Emarginula 



Epiphragmophora. 



Epitonium 



Erycina 



Eucalodium 



Eulima 



Euspira 



Exilia 



Fusinus 



Galeodea 



Gobraeus 



rage 



2 



2 



2 



2 



2 



2 



3 



17 



11 



4 



5 



5 



12 



5 



5 



6 



6 



22 



6 



6 



9 



9 



9 



10 



30 



11 



11 



14 



15 



15 



2 



15 



15 



15 



15 



15 



16 



15 



16 



16 



28 



27 



16 



17 



20 



17 



17 



17 



17 



23 



Gyrinopsis . - 

 Helicofusus _ . 

 Ischnochiton. 



Lacuna 



Latisipho 



Lima--' 



I'age 



18 



24 



18 



18 



11, 12 



18 



Limatofusus 13, 14 



Liocyma 18 



Liomesus 18 



Liotia 19 



Liriola 26 



Litlorina 19 



Lyonsia 19 



Lyropeden 23 



Macoma 19 



Mactra 19 



Mactrotoma 19 



Margarites 19 



Marginella 20 



Melanclla 20 



Metula 20 



Metzgeria 20 



Microgaza 20 



Mitra 20 



Mohnia 21 



Murex 21 



Neptunea 22 



Nucula 22 



Nuttallia 26 



Orectospira 5 



Ostrea 23 



Parvilucina 23 



Pecten 23 



Phacoides 23 



Phcnacoptygma 23 



Pholadomya 24 



Plicatula 24 



Plicifusus 24 



Psammobia 23 



Pseudamusium 24 



Pteropurpura 21 



Puncturella 24 



Pupillaria 24 



Pyrulofusus 25 



Raetina 2 



Recluzia 25 



Reiifusus 25 



Sangidnolaria 26 



Semele 26 



Serripes ._ 26 



