84 CRETACEOUS PALEONTOLOGY. 



Gastropoda. 



Scala sillmani Mort. 

 Turritella tippana Con. 

 Turritella marshalltownensis n. sp. 

 Pyropsis sp. 

 Rapana stcm-toni n. sp. 

 • Volutomorpka hiplicata Gabb. 



Cephalopoda. 



Placenticeras placenta (DeKay). 

 Twrilites pauper Whitf. 



Locality i8o. — 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. 

 Gryphaca inutabilis Mort. 

 Gryphaea coiiiz'cxa Mort. 

 Gryphaeostrea vomer (Mort.) 

 Neithea quinquecostata (Sow.) 

 Plagiostoma erecta (Whitf.). 

 Anomia argentaria Mort. 

 Carditun teninstriaUun Whitf. 



Gastropoda. 

 Pyropsis sp. 

 Odontofiisus medians Whitf. 



