TABLE OF CONTENTS. VII 



Systematic list — Continued. 



Class Gastropoda — Continued. 



Order Orthodonta — Continued. Page. 



Family Muricidae 59 



Genus Murex 59 



Genus Trophon 59 



Genus Tritonalia 60 



Genus Sistrum 60 



Genus Thais 61 



Genus Latiaxis 61 



Family Coralliophilidae 61 



Genus Coralliophila 61 



Genus Melapium 62 



Family Scalidae 62 



Genus Epitonium 62 



Genus Acrilla 64 



Genus Graphis 64 



Family Janthinidae 65 



Genus Janthina 65 



Family Eulimidae 65 



Genus Melanella 65 



Genus Subeulima 70 



Genus Niso 70 



Family Pyramidellidae 71 



Genus Pyramidella 71 



Genus Turbonilla 75 



Genus Odostomia 85 



Family Atlantidae 92 



Genus Atlanta 92 



Family Cymatiidae 92 



Genus Bursa 92 



Genus Eugyrina 93 



Genus Argobuccinum 93 



Genus Cymatium 93 



Genus Nyctilochus 94 



Genus Cryotritonium 95 



Genus Aspella 95 



Family Cassididae 95 



Genus Cassis 95 



Family Doliidae 96 



Genus Dolium 96 



Family Amphiperasidae 96 



Genus Amphiperas 96 



Family Cypraeidae 96 



Genus Cypraea 96 



Family Triviidae 98 



Genus Trivia 98 



Family Triphoridae 98 



Genus Triphons 98 



Family Cerithiopsidae 109 



Genus Cerithiopsis 109 



Genus Seila 113 



Genus Eumeta 116 



