84 CRETACEOUS PALEONTOLOGY. 



GASTROPODA. 



Scala sillmani Mort. 



Turrit ella tippana Con. 



Turritella marshalltownensis n. sp. 



Pyropsis sp. 



Rapana stantoni n. sp. 



Volutomorpka biplicata Gabb. 



CEPHALOPODA. 



^ P lac entic eras placenta (DeKay). 

 Turrilites pauper Whitf. 



Locality 180. The Marshalltown clay-marl is exposed about 

 2.5 miles southwest of Swedesboro, and about the same distance 

 northwest from Harrisonville station, near the headwaters of 

 one of the tributaries of Old Man's Creek. The fauna here is 

 much inferior to that last mentioned, both in number of species 

 collected and in the state of their preservation. The following 

 forms have been observed : 



VERMES. 



Serpula sp. 



PELECYPODA. 



Ostrea panda Mort. 

 Gryphaea mutabilis Mort. 

 Gryphaea convex a Mort. 

 Gryph-aeostrea vomcr (Mort.) 

 Neithea quinquecostata (Sow.) 

 Plagiostoma erecta (Whitf.). 

 Anomia argentaria Mort. 

 Cardium tenuistriatum Whitf. 



GASTROPODA. 

 Pyropsis sp. 

 Odontofusus medians Whitf. 



