16 Hill Paleontology of the Trinity 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 : 



Patellina texana (Roemer). 



Echinodermata : 



Epiaster (?) sp. indet. 



Verm es : 



Serpula paluxiemis sp. nov. 



Molluscoidea : 



Genus indeterminate. 



Mollusca : 



Anomia texana sp. nov. 

 Ostrea franklini Coquand. 

 Ostrea franklini ragsdalei var. no. v 

 Pecten stantoni sp. nov. 

 Modiola branneri sp. nov. 

 Leda harveyi sp. nov. 

 Cucuttsea gratiota Hill. 

 Cucull&a comanchensis sp. nov. 

 Cucutt&a terminalis Conrad. 

 Barbatia parva-missouricnsis Hill. 

 Trigonia stolleyi sp. nov. 

 Trigonia crenulata Roemer. 

 Chione (?) decepta s'p. nov. 

 Eriphyla pikensis Hill. 

 Requienia texana (?) (Roemer). 

 Monopleura marcida White. 

 M. pinguiscula White. 

 Corbic,ula arkansaensis Hill. 

 Car dium (?) sevierense PI ill. 

 Protocardia sp. indct. 

 Pholadomya knowltoni sp. nov. 

 Pholadomya ierchi sp. nov. 

 Pleuromya (?) henselli sp. nov. 

 Isocardia (?) medialis Conrad. 

 Natica (?) texana Conrad. 



