NICKLES AND BASSLEK.] 



GEOLOGIC DlSTKIiniTlON, 



lUl 



Lists of species — Continued. 

 DEVONIAN— Continue.!. 



Thamniscua inultiramut* Hall 



nanus Hall 



pauciramus Hall , 



Thamnotrypa divaricata (Hall) 



Treniatella annulata (Hall) 



arborea (Hall) 



glomerata ( Hall ) 



nodosa ( Hall and Simpson ) . 



perspinulata (Hall) 



Tropidopora nana Hall 



Unitrypa acaulis ( Hall ) 



acclivis (Hall and Simpson) .. 



anon yma ( Hall ) 



? elegantissima ( Hall ) 



fastigata ( Hall) 



ficticia ( Hall and Simpson ) . . . 



lata (Hall) 



nana (Hall and Simpson) 



pernodosa (Hall) 



scalaris (Hall) 



substriata (Hall) 



tegulata ( Hall) 



Oriskany. 



Upper 

 Held. 



X 



X 



X 



X 

 X 

 X 

 X 



X 



Htiniiltdii. 



X 

 X 



X 

 X 



X 

 X 



X 

 X 

 X 



X 

 X 

 X 



X 



X 



MISSISSIPPIAN. 



