Xn CONTEiSITS. 



Systematic arrangement — Continued. 

 Gastropoda — Continued. 



Order Ctenobrancliiata — Continued. 



Family Trocliidae — Continued. Page. 



Genus Calliostoma 111 



metrium 111 



tampicum 111 



Genus Margarites 112 



tampaensis 112 



Family Delphinulidae 112 



Genus Liotia 112 



(Arene) solariella 112 



coronata 112 



Family Helicinidae 113 



Genus Helicina 113 



ballista 113 



var. tampae , 113 



posti 113 



Family Neritidae 114 



Genus Nerita 114 



tampaensis 114 



Family Fissurellidae 114 



Genus Fissuridea ^ — 114 



chipolana 114 



Genus Fissurella 115 



(Cremides) ceryx 115 



Order Polyplacophora 115 



Family Chitonidae 115 



Genus Isclinochiton 115 



tampaensis 115 



Order Prionodesmacea 116 



Family Nuculidae 116 



Genus Nucula 116 



tampae 116 



Family Ledidae 116 



Genus Leda 116 



flexuosa 117 



posti ^ 117 



Genus Yoldia 117 



frater 117 



Family Arcidae 118 



Genus Area 118 



umbonata 118 



granimatodonta 118 



paratina 119 



Barbatia (Calloarca) niarylandica 119 



irregularis 119 



arcula 120 



(Acar) reticuL'ita 120 



(Fossularca) adanisi 121 



Scapharca hypomela _" 121 



latidentata 121 



Grenus Glycymeris 122 



lamyi 122 



