IG. Hill — Paleoidologii of the Triniti/ Division. 



have not been studied. In this paper will be presented a pre- 

 liminary study of its invertebrate fauna. 



The following is a list of the fossils collected or observed by 

 the writer from all the beds of the Trinity Division in Arkansas 

 and Texas : 



Foraminifera : 



Pntdlina tcxann (Ivoemer). 



Echinodermata : 



Epindcr (?) sp. indet. 



Vermes : 



SerpiiJa ftaluxiensis sp. nov. 



Molluscoidea : 



Genus indeterminate. 



Mollusca : 



Anomia texana sp. nov. 

 Ostrea franklini Coqu an d . 

 Ostrenfranklini ragsdalci var. nov 

 Pecten slantoni sp. nov. 

 Modiola hranneri sp. nov. 

 Leda harveyi sp. nov. 

 Cuculln'a grallota Hill. 

 Gucxdhva comanchensis sp. nov. 

 CamlLxa tcrminalis Conrad. 

 Barhatia parva-missouriensis Hill . 

 Trigonia doUeyl sp. nov. 

 Trigonia crenulata Roemer. 

 Chionc (?) deccpta sp. nov. 

 Eriphyla pikcnsis Hill. 

 Requienia texana (?) (Roemer). 

 Monnpleura mareida White. 

 M. pinguiscula White. 

 Corhicula arkansaensis Hill. 

 Cardimn (?) sevierense Hill. 

 Protocardia sp. indet. 

 Phnladomya. knoivUoni sp. nov. 

 PJioladomya lereJii sp. nov. 

 Pleuromya (?) henselli sp. nov. 

 Isocardia (?) medial is Conrad. 

 Natica (?) texana Conrad. 



