THE MARSHALLTOWN. 83 



ing perfectly preserved. The shells are very abundant at this 

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



Vermes. 



Serpnla circularis n. sp. 

 Hamulus f ale at us (Con.). 



PelEcypoda. 



Nucula percrassa Con. 

 Nemodon eufaulensis (Gabb). 

 CucuUaew tippana Con. 

 Inocerainus proxinms Tuom. 

 Ostrea falcata Mort. 

 Ostrea plumosa Mort. 

 Gryplmea inutabilis Mort. 

 Gryphaeostrea vomer (Mort.). 

 Bxogyra ponderosa Roem. 

 Trigonia thoraciea Mort. 

 Neithea quinqweeostata (Sow.). 

 Lima retieidata (L. & F.). 

 Lima- whitHeldi n. sp. 

 Plagiostoma ereeta (Whitf.). 

 Anomia argentaria Mort. 

 Paranomia scabra (Mort.). 

 Crenella serica Con. 

 Veniella conradl Mort. 

 Btea earolinensis Con. 

 CrassateUites suhplaniis (Con.). 

 Unieardium iimbonata (Whitf.). 

 Lucina swedesbofoensis n. sp. 

 Cardhim tcnuistriatum Whitf. 

 Cyprimeria exeavaia (Mort.). 

 Meretrix eufaulensis (Con.). 

 Mcrefrix eretacea (Con.). 

 Linearia metastriata Con. 

 Cymbophora lintea (Con.). 

 Corbtda szuedesboroensis n. sp. 

 Tumus k'ic mmeli n. sp. 

 Martesia eretacea Gabb. 



