TABLE OF CONTENTS. 





PAGE 





PAGB 



Genus Protocardia 



97 



Order Ctenobranchiata 



111 



Protocardia Sliumardi . 



93 



Suborder Rostrifera . 



111 



Family Anatinid^e . ... 



99 



Family Valvatid^ 



111 



Genus Myacites 



99 



Genus Valvata . 



112 



Myacites nebrascensis 



100 



Subgenus Tropidina 



113 



subellipticus . 



101 



Valvata? scabrida 



113 



Genus Thracia 



101 



Family Viviparid.^ 



113 



Thracia ? sublasvis 



102 



Genus Yiviparus 



114 



? arcuata 



102 



Viviparus Gilli 



115 



Genus Pholadomya 



102 



Genus Lioplacodes 



115 



Pholadomya humilis 



104 



Lioplacodes veternus . 



116 



Class Gasteropoda 



105 



Class Cephalopoda .... 



116 



Subclass PULMONIPERA 



105 



Order Tetrabranchiata . 



116 



Order Inoperculata 



105 



Family AaiMONiTiDiE 



116 



Suborder Limnophila 



105 



Trigonelletes 



118 



Family Limn^id^ . 



105 



Genus Ammonites 



121 



Subfamily Limn^in^ . 



105 



Ammonites cordiformis 



122 



Subfamily Physin^ 



105 



Ammonites Henryi . 



123 



Subfamily Planorbin^ 



105 



Order Dibranchiata 



124 



Genus Planorbis 



106 



Suborder Decapoda 



124 



Planorbis veternus 



101 



Family Belemnitid.^ . 



124 



Subclass Prosobranchiata 



108 



Genus Belemnites 



124 



Order Riphidoglossata . 



108 



Belemnites densus 



126 



Suborder Podopthalma 



108 







Family Neritid^ . 



108 



Articulata 



12Y 



Genus Neritella 



108 



Class Annulata 



12'r 



Neritella nebrascensis 



109 



Order Tubicola . . ' . 



12T 



Order Cyclobranchiata 



110 



Family Serpulid^s; 



121 



? Family Dentaliidje 



110 



Genus Serpula .... 



12t 



Genus Dentalium . 



111 



Serpula ? 



128 



Dentalium subquadratum 



111 







