The Mollusca of Eastern Iowa. 65? 



S. AVARA — Say. 



Two forms occur. The small one in high, rocky places, 

 the larger (probably var. vermeta — Say) in low, wet places. 

 The latter is very common, and much more gregarious. 

 Both forms are very common Lcess fossils. 

 S. OBLiQUA. — Say. 



Very common on low timbered bottoms. Also abundant in 

 the L,<xss. 



The fossil Succineas are a puzzle. They seem to unite S. 

 obliqua with the larger form of S. azwa, which again grades, 

 into the smaller form. It is practically impossible to definitely 

 identify some of these fossil forms with any of the recognized 

 species. While this difficulty is encountered in the study of 

 recent specimens it is tenfold greater in the case of the fossils. 

 No doubt many of the recognized species will be reduced to 

 synonyms. 



ORDER— BASOPvIlVIATOPHORA. 



SuB=OrDER— GEHYDROPHIIiA, 



FAIVIILY— AURICULIDiE. 

 Genus Carychium. — Muell. 



C. EXIGUUM. — Say. 



This minute pupa-like species is very common under logs, 

 etc., in moist places. 



Sub=Order— Hygrophila. 

 FAMILY— LIMNiEIDiE. 



5 UB-FAM L 1 '—LIMN^-EIN.^. 

 Genus jLiinncea. — Lam. 

 Sub-i^enus — Liinncea . 



L. STAGNALIS. — L. 



Not uncommon in some of the lakes and ponds in the north- 

 ern part of the state. 



