BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 21, pp. 497-516 September io, 191o 



IXTEE^AL CHAEACTEES OF SOME MISSISSIPPIAJ^ 

 EHY^TCHONELLIFOEM SHELLS^ 



BY STUART WELLER 



(Presented hij title iefore the Society December SI, 1909) 



CONTENTS 



Page 



Introduction 498 



Camarophoria King 498 



Camarophoria schlotheimi (von Buch) 498 



Camarophoria hamburgensis n. sp 500 



Camarophoria explanata (McChesney) 501 



Tetracamera n. gen 50S 



Tetracamera suhcmieata (Hall) 503 



Tetracamera suMrigona (M. «& W. ) 504 



Rhynchotetra n. gen 506 



Rhynchotetra caput-testudinis (White) 506 



Pugnax Hall and Clarke 508 



Piignax pugnus (Martin) 508 



Allorhynchus n. gen 509 



Allorhynchus heteropsis ( Winchell) , . 509 



Allorhynchus macra (Hall) 509 



Camarotcechia Hall and Clarke 510 



General characteristics 510 



Camarotcechia chouteauensis n. sp 510 



Wilsonia Kayser 510 



Wllsonia grosvenori (Hall) 510 



Leiorhynchus Hall 511 



Leiorhynchus greeneanum (Ulrich) 511 



Pugnoides n. gen 512 



Pugnoides ottimnva (White) 512 



Shumardella n. gen 512 



Shumardella missouriensis (Shumard) 512 



Shumardella obsolescens ( Hall ) 513 



Rhynchopora King 514 



General characteristics 514 



Rhynchopora pustulosa (White) 514 



Rhynchopora hamburgensis n. sp 514 



Rhynchopora beecheri Greger 514 



Rhynchopora persinuata (Winchell) 515 



Rhynchopora ? cooperensis ( Shumard) 515 



Manuscript received by the Secretary of the Society April 29, 1010. 



XXXV — Bull. Geol. Soc. Am., Vol.. 21, 1909 (497 



