Contributions to Invertebrate Palseontology. 545 



DisciNA Lamarck. 



D.' Lodensis Hall. 



D. minuta Hall. 

 Strophomena Rafinesque. 



S. rhomboidalis Wilck. 

 Chonetes Fischer. 



C. scitula Hall. 



(J. reversn Whitf. 

 Spirifera Sowerby. 



S. Maia Billings. 



S. zic-zac Hall. 

 Leiorhynchus Hall. 



L. limit a r is Yanuxem. 

 LAMELLIBRANCHIA TA. 

 Aviculopecten McCoy. 



A. equilaterus Hall. 

 Pterinea Goldfuss. 



P. similis Whitf. 

 AcTiNODESMA Sandbefger. 



A. subrectumVIhiiL 

 Grammysia DeYern. 



G. hisulcata Conrad. 

 Ts YASSA H. and W. 



N. arguta H. and W. 



