OF PLANORBIS AT STEINHEIM. . 



97 



VI. Lists of Species by Formations. 



Lower Period, or Period of Rock Deposits. 



Neuseliialder Rocks. 



PI. solldus. 

 PL declivis. 

 PL Larteti or conulus. 



pj oxvstomus 



PL platystomus. 

 PL exusius. 



Coarse Limestone. 

 PL oxystovms. 



PL Hllxjendorfi. 

 PL levis. 



~pi sHprermis 



Til oxyatomus 

 ■'■ ''• levis. 



PL parvus. 



PL 



tenuis 

 Steinheimensis. 



Oxystomus Limestone. 

 PL oxystomus. 



Valley Rock. 

 PL discoideus. 



PI 



supremits 

 ' oxystomus. 



Z>J tenuis 



-^ *" Steinheimensis. 



PL discoideus. 



TD] oxystomus 

 ■'- '• levis. 



PL discoideus. 



Cloister-Ridge Rocks. 

 (Lower Tier.) 



PL temiis. 



(Upper Tier.) 



7D7 tenuis 



-^ ^' .Steinheimensis. 



PL tenuis. 



PL 



discoide.us 

 tenuis. 



PL tenuis, turreted variety. 



JDJ discoideus 

 -*■ t" tp.niiis. 



Upper Period, or Period of Pit Deposits. 



PL Steinheimensis var. 



aequiiimbilicafus. 

 PL Steinheimensis. 



T>J oxystomus 

 ■^ ''• levis. 



T>J Kraussii 



■*■ ^' Steinheimensis. 



PL minutus. 



PL discoideus. 

 PL trochiform,is. 



Formation a. 



'pi tenuis 



Steinheimensis. PL discoideus Vai". like eiCganS 



PL tenuis. Hilg. 



PL discoideus. PL trochiformis. 



PL discoideus var. involutiis. PL denudatus. 



pi trochiformis 

 -^ ^* discoideus. 



Formation d. 



PL minutus. 

 PL costatus. 



PL tenuis, turreted variety. 



PL triquetrus. 

 PL oxystomus. 



