THE MARSHALLTOWN. 83 



ing perfectly preserved. The shells are very abundant at this 

 locality, the species which have been identified being as follows : 



VERMES. 



Serpula circularis n. sp. 

 Hamnlus falcatus (Con.). 



PELECYPODA. 



Nucula per crass a Con. 

 Nemo don cufaulensis (Gabb). 

 Cucullaca tippana Con. 

 Inoceramus proximus Tuom. 

 Ostrea falcata Mort. 

 Ostrca plumosa Mort. k 

 Gryphaca mutabilis Mort. 

 Gryphaeostrea vomcr ( Mort. ) . 

 Exogyra ponderosa Roem. 

 .. . Trigonia thoracica Mort. 



Neithea quinqitecostata (Sow.). 



Lima reticulata ( L. & F. ) . 



Lima iwhitficldi n. sp. 



Plagiostoma erecta (Whitf.). 



Anomia argentaria Mort. 



Paranomia scabra (Mort.). 



Crenella serica Con. 



Veniella conradi Mort. 



Htea carolinensis Con. 



Crassatellites subplanus (Con.). 



Unicardium umbonata (Whitf.). 



Lucina sutedesboroensis n. sp. 



Cardium tennistriatum Whitf. 



Cyprimeria excavata ( Mort. ) . 



Merctrix eiifaulcnsis (Con.). 



Meretrix cretacea (Con.). . 



Linearia metastriata Con. 



Cymb op hora lintea (Con.). 



Corbula szvedesboroensis n. sp. 



Turnus kummeli n. sp. 



Martesia cretacea Gabb. 



