TABLE OF CONTENTS. 



Page. 



Introduction 1 



Geological exploration of tbe beds .' 2 



Relations of the fauna of the Orthaulax pugnax zone 16 



Sources of material 17 



Acknowledgments 17 



List of species 18 



Systematic arrangement 22 



Gastropoda 22 



Order Pulmonata 22 



Family Helicidae 22 



Genus Cepolis 22 



(Plagioptycha) latebrosa 22 



instrumosa 23 



direpta 23 



Genus Pleurodonte 23 



haruspica 23 



crusta 24 



cunctator 24 



diespiter 24 



Genus Polygyra 24 



adamnis 24 



Family Bulimulidae 25 



Genus Bulimulus 25 



(Hyperaulax) floridanus 25 



heilprinianus 25 



americanns 26 



tampae 26 



• ballistae 26 



stearnsii 27 



tortilla 27 



remolina 27 



Family Cerionidae 28 



Genus Cerion 28 



(Eostrophia) anodonta 28 



Anodonta var. floridanum 28 



Genus Microcerion 29 



floridanum 29 



Family Pupillidae 29 



Genus Pupoides ^ 29 



pilsbryi 29 



Family Urocoptidae 30 



Genus Urocoptis = 30 



floridana 30 



V 



