416 



IMa-Oli'l' OL'^ STAT K (i KOLOG I S T. 



toechia whilei, and DictyoiieUa reiiculala. hi the Louisville litue- 

 stone fauna 39 brachiopods appear which are unknown in the 

 Waldron shale. These represent 65 per cent of the total brachiopod 

 fauna of the Louisville formation and include several large species 

 of the pentameroid group of which Pentamerus ohlongus and Con- 

 chidium knappi are examples. The two lists show that 47 per cent 

 of the Waldron brachiopods continue into the Louisville limestone. 

 Nettleroth 's observations on some of these show that many of them 

 are represented in the later fauna by dwarfed specimens. 



In the groups not yet discussed it is believed that the list of the 

 Louisville fauna is too incom])leto to justify close comparison. 



