418 ILLINOIS STATE ACADEMY OF SCIENCE 



Planorhis parvus urhanensis, rare. 

 Pliysa warreniana, rare. 

 Galha obrussa exigua, rare. 



BIVALVES (PELECYPODS) 



Spliaerium rJiomhoideum, rare. 



Pisidium splendididum, not common. 



Two species of land shells, starred in the above list, 

 occur in the Fisher collection that were not included in 

 the Ferriss collection. On the other hand, 35 species 

 occur in the Ferriss collection that are not in the Fisher 

 collection, Mr. Ferriss collected the material many- 

 years ago when exposures were better than at present 

 and also gave much more time to collecting, visiting the 

 quarry many times. The marl material is commented 

 upon on a previous page. 



STATION NO. 2 



Locality : Bank of DuPage River, S. W. 1/4 of N. W. i^, 

 Sec, T. 35 N., R. 9 E., Joliet Quadrangle. 

 Material : Alluvial clay. 

 Stratigraphic horizon: Pre-recent. 



MOLLUSCAN LIFE (lAND PULMONATEs) 



Pohjgijra clausa (Say), rare, Succinea ovalis Say, 

 common. 



station no. 3. 



Locality: South edge of southern slough, SE. 14 of 

 SW. 1/4, Sec. 31, T. 36 N., R. 10, E. 

 Material: Alluvial clay. 

 Stratigraphic horizon : Pre-recent. 



MOLLUSCAN LIFE ( AQUATIC PULMONATES) 



Planorhis trivolvis pseudotrivolvis Baker, not com- 

 mon. 



Planorhis parvus Say, not common. 



Physa gyrina Say, not common. 



Galha elodes Say, not common. 



These mollusks are such as live in swampy pools or 

 sloughs where the water is more or less stagnant. 



