CONTENTS. XI 



Systematic arrangement — -Continued. 

 Gastropoda— Continued. 



Order Ctenobranchiata — Continued. 

 Family Turritellidae — Continued. 



Genus Turritella — Continued. Page. 



systoliata 99 



litharia 99 



atacta 100 



Family Viviparidae 100 



Genus Lioplax .• 100 



floridaua 100 



Family Assiminiidae 101 



Genus Assiminea 101 



aldra 101 



Family Rissoidae 101 



Genus Rissoina 101 



supralaevigata 101 



Genus Amnicola 102 



adesta 102 



sp. indet 102 



Genus Crucibulum 102 



constrictuni 102 



Genus Calyptraea 103 



trochiformis 103 



Family Hipponicidae 104 



Genus Hipponix 104 



pygraaeus 104 



willcoxii 104 



Family Xenoplioridae 105 



Genus Xenopliora 105 



conchyliopliora 105 



Family Naticidae r 105 



Genus Natica 105 



(Cryptonatica) floridaua 106 



Genus Polinices 106 



(Euspira) lieniicryptus 106 



Genus Ampullina . 107 



streptostoma 107 



amphora 108 



solidula 108 



Genus Amauropsis 108 



floridaua 108 



Genus Sinum 109 



cliipolanum 109 



iniperforatum 109 



Family Turbinidae 109 



Genus Turbo 109 



(Senectus) creuorugatus 110 



Genus Astraea 110 



(Lithopoma) sp. indet 110 



Family Trochidae 110 



Genus Tegula 110 



(Omphalius) exoleta 111 



