290 C. R. KEYES — CARBONIFEROUS STRATA OF CENTRAL IOWA. 



Bulimorpha miniita, Stevens. 



" (?) chrysalis, Meek and Worthen. 



Orthonema conica, Meek and Worthen. 

 Acllsina minuta, Stevens. 



" rohusta, Stevens. 

 Sfraparolliis catilloides, Conrad. 



pernodosus, Meek and Worthen. 

 Bellerophon percarinaius, Conrad. 

 " urii, Fleming. 



" monfortianus, Norwood and Pratteu. 



Loxonema scitula, Meek and Worthen. 



" multicosta, Meek and Worthen. 

 Murchisonia quadricarinata, Worthen. 

 Sphcerodoma medialis, Meek and Worthen. 

 Soleniscus newberryi, Stevens. 



" hiimiUs, Keyes. 



" graeills, Cox. 



" paludinceformis, Hall. 

 Streptacis ivhiffieldi, Meek. 

 Anomplialus rotidus, Meek and Worthen. 

 Naticopsis nana, Meek and Worthen. 

 Trachydomia wheeleri, Swallow. 



CEPHALOPODA. 



Nautilus occidentalis, Swallow. 



" winslovi, Meek and Worthen. 



" lasallensis, Meek and Worthen. 

 Goniatites nolinensis, Cox. 

 Orthoceras rushensis, McChesney. 

 Orthoceras, sp. und. 



AJVTHROPOBA. 



Cythere 7iebracensis, Geinitz. 

 Phillipsia, sp. und. 



VEETEBRATA. 



Petrodus occidentalis, Newberry and Worthen. 



" sp. und. 

 Deltodus intermedius, St. John and Worthen. 

 Thrinacodus duplicaius (?), Newberry and Worthen. 



