MOLLUSCA FROM INDIANA AND OHIO 455 



Pupillidae 



Gastrocopta contracta (Say) = Bifidaria contracta. Apparently 

 rare in the deposit as but two specimens were found. These shells 

 are typical but smaller than the average of living contracta. 



Succineidae 



Succinea avara vermeta Say. A single specimen of this race of 

 avara, about 5 mm. long, was found in the material. It is, therefore, 

 to be considered as rare. 



Endontidae 



Helicodiscus parallelus (Say). This common and widely distrib- 

 uted land shell occurred infrequently. The shells are smaller 

 than those of the recent fauna and the spiral striation is but faintly 

 developed. 



Pyramidula soUtaria (Say). The most abundant mollusk in 

 the deposit. There is considerable variation among the individuals 

 in the height of the spire. The largest specimen measures 30 mm. 

 in greatest diameter. The majority of shells are typically banded. 

 In a few individuals the reddish bands are very wide, leaving a 

 broad peripheral band of white. 



Pyramidula solitaria alhina (W. G. Binney). A few individuals 

 of solitaria without bands occur with the typically banded specimens. 



Pyramidula alternata (Say). Found infrequently as compared 

 with solitaria. As in the recent shells of this species the fossil 

 examples vary in the height of the spire and in the degree of cari- 

 nation of the periphery of the last whorl. The color varies from 

 albino to the most marked flames of red. 



Pyramidula alternata alba (Tryon). Three examples of the 

 albino variety were found associated with the more typical forms. 

 The variety is apparently rare. 



Zonitidae 



Gastrodonta ligera (Say). This zonitoid land shell occurs rarely 

 in this deposit. The few specimens found are smaller than shells 

 from the recent fauna. 



Vitrea indentata (Say). Two immature but characteristic 

 examples of this imperforate Vitrea were found in the sand taken 

 from the larger shells. 



