146 PROCEEDIN(iS OF THE ACADEMY OF [1890. 



Of the molluscan forms named above whose depth is known, 54 

 were from the two fossiliferous beds included between 677 and 757 

 feet. Of these 37 were found in the lower of the two divisions — 10 

 of these and 17 others making together 27, Avere found in the upper 

 of the two divisions. Of the forms in both divisions, 26 have been 

 found at Shiloh and Jericho, and include several species especially 

 characteristic of these localities and j^robably belong to the same 

 bed. 



Five of the above and nine others wei'e found at 875 feet, viz : — 



ASTARTE ThOMASII. 



AsTARTE CoMPSONEMA. Also at 725 feet. 

 Cardita granulata. Also 677 to 757 and below. 

 Cerithium. 



CORBULA. 

 FULGUR. 



LiTciNA CRENULATA. Also 757 and below. 

 Lyrosoma sulcosa. Also lower. 

 Natica catenoides. Also 677 to 756. 

 i^eptunea migrans. 

 Pleurotoma Marylandica. 

 Pleurotoma limatula. Also lower. 



TURRITELLA SECTA. 



'Tritia trivittata. Also 725. 



The following three shallow water species were obtained at about 

 1000 feet in association with Balanus. 



OSTREA. 



Pecten Marylandica. 

 Petalaconchas sculpturatus. 



Cardita granulata occurred at 1180 feet also at 875 feet and in 

 both divisions of the horizon, between 677 to 757 feet. 



In the tough clay bed below 1335 feet were the following: 

 Dentalium dentalis. 



GOULDIA LIMATULA Or AsTARTE. 



LuciNA CRENULATA. Also higher. 



Ly^rosoma sulcosa. Also at 875. 



Ne^era sp. ? 



Pecten comparilis. 



turritella secta. 



VoLVULA or Bulla. 



To these should be added the coral (Placocyathus) before noted. 



