370 C. L. Fenton — The Hackberry Stage of 



Naticopsis gigantea H. & W. var. 

 Westernia crassa Webster. 

 Westernia owenensis Webster. 

 Westernia gigantea Webster. 

 Cephalopoda 



Orthoceras sp. undet. 

 Cyrtoceras sp. undet. 



II. — Ila: Fossil species of the Spirifer zone. 

 Plants 



1 ' Fucoids, ' ' of three or more species. 

 Animales 

 Coelenterata 



Cliona hackberryensis Thomas. 



Cliona sp. undet. 

 Anthozoa 



Zaphrentis solida H. & W. 



Heliophyllum scrutarium Clarke & Swartz. 



Cyathophyllum sp. undet. (nov. ?). 



Cystiphyllum mundulum H. & W. 



Char act ophy Hum nanum H. & W. 



Strombodes johanni (H. & W.). 



Strombodes johanni multiradiatus (H. & W.). 



Pachyphyllum woodmani (White) . 



Pachyphyllum woodmani, cf . gregarium Webster. 



Pachyphyllum crassicostatum Webster. 



Pachyphyllum n. sp. 



Pachyphyllum ordinatum Webster. 



Pachyphyllum crassum Webster. 



Macgeea solitaria (H. & W.). 



Macgeea parva Webster. 



Macgeea culmula Webster. 



Acervularia inequalis H. & W. 



Acervularia profunda Hall. 



Acervularia n. sp. (cf. inequalis). 



Chonophyllum ellipticum H. & W. 



Chonophyllum n. sp. 



Alveolites rockfordensis H. & W. 



Cladopora robusta Rom. 



Cladopora cf. palmata H. & W. 



Aulopora iowensis H. & W. 



Aulopora saxivadum H. & W. 



Aulopora filiformis Billings. 



Aulopora, several new ( ?) species. 



Syringopora n. sp. (?). 

 Hydrozoa ( ?) 



Stromatoporella solidula (H. & W.). 



Stromatoporella incrustans (H. & W.). 



