Palaeontology of Certain Chester Formations. 185 
Trilobites; pygidia of Phillipsia?. 
Camarophoria explanata (McChesney). 
Cliothyridina sublamellosa (Hall). 
Composita sulcata, Weller. 
Composita trinuclea (Hall). 
Productus sp?. 
Pustula sp?. 
Spirifer sp?. 
In addition to the fauna listed and correlated above, a brief examin- 
ation was made of the massive limestone beds lying below the formation 
interpreted as Renault limestone. In the best exposure found good 
specimens of fossils were not abundant, and the exact location of the 
lowest Chester bed was therefore not ascertained. Stems of Platycrinus 
huntsvillae, Wachsmuth and Springer, were, however, found at forty-five 
to fifty feet’ below the limestone named here Renault, thus indicating 
the presence of the Ste. Genevieve as defined by Weller, and fixing the 
lower limit of the Chester and therefore the upper limit of the Ste. 
Genevieve at a level not more than forty-five or fifty feet below the 
fossiliferous Renault limestone layer. 
