Branson — The Fauna of the Residuary Auburn Chert. 



51 



Trenton Period 



Gastropoda — Con'd 



;o 



p^ 



m 



o 



Bellerophon capax Ulrich 



Bucania halli U. and S 



Eotomaria dryope Billings 



Helcionopsis sp. undet 



Helicotoma missouriensis n. sp. . . 

 Helicotoma tennesseensis Safford. 



Holopea insignis U. and S 



Hormotoma jasciata n. sp 



Hormotoma gracilis v. sublaxa Hall 

 Hormotoma latiangularis n. sp. . . . 



Liospira micula Hall 



Liospira progone Billings 



Liospira n. sp 



Lophospira fillmorensis Ulrich . . . . 



Lophospira obliquua Ulrich 



Lophospira oiveni U. and S 



Lophospira perangulata Hall 



Lophospira saffordi Ulrich 



Pterotheca expansa Emmons 



Pterotheca sp. undet 



Strophostylus tcxtilis U. and S . . . . 



Cephalopoda 



Cyrtoceras billingsi Salter . 



Cyrtoceras sp. undet 



Orthoceras bilineatum Hall 

 Orthoceras sociale Hall. . . . 



Trilobita 



Baihyiirus spiniger Hall 



Bumastus trentonensis Emmons. 

 Ceraurus pleurexanthemus Green . . 



Isotelus ioivensis D. D. Owen 



Pterygometopus lincolnensis n. sp. . 

 Pterygometopus intermedius Clarke 

 Ptychopyge sp. undet 



Ostracoda 



Primitia n. sp 



Prim,itia n. sp 



Relationships uncertain 



Technophorus bellistriatus n. sp 



Hudson 

 River 

 Period 



c3 P 



fl O I o O 



io so 



■73 



rt 



o 



tf 



UL 

 B 



Pi 



TULR 

 BT 



SBT 

 BU 



S 



X 



B 

 UL 



S 



s 



ST 



B 



ST 



tf 



Pi 



03 



o 



B 



BT 



B 



T 



BT 

 T 



B 

 BT 



BT 

 BT 

 B-H 



