while older ones have in numerous cases disappeared and in others have 

 changed their proportional representation in the rock as compared with other 

 members of the fauna. 



LIST OF FOSSILS OF THE TAMPA LIMESTONE. 



Those from the Orbitolitic limestone above the silex beds, on the peninsula of which 

 Ballast Point forms the extremity, are marked B ; those from the limestone at Jackson- 

 boro', Screven County, Georgia, are marked J. The asterisk denotes that the species 

 is also known in the recent state. Species obtained from wells sunk in this limestone 

 in the town of Tampa are marked A; those from Six-Mile Run are indicated by C; 

 those from a well seven miles northeast from Tampa are marked D, and those from 

 near Orient by E. Those marked F are from a well three and a half miles northeast of 

 Tampa. 



Bulimulus (Hyperaulax) americanus 



Heilprin, B. 



Tornatina Wetherilli Lea, A, E, F, B. 

 Scaphander grandis Aldrich, D. 

 Scaphander primus Aldrich, A, E, J. 

 Bulla petrosa Conrad, D, J. 

 Bulla, two sp., J. 



Conus planiceps Heilprin, A, C, D, E, F. 

 Pleurotoma servata Conrad, J. 

 Pleurotoma sp., J. 

 Drillia sp., J. 

 Olivella lata Dall, B, E. 

 Ancilla Shepardi Dall, F. 

 Marginella bella Conrad, A. 

 Mitra n. sp., J. 



Conomitra staminea Conrad, C. F. 

 Vasum subcapitellum Heilprin, B. 

 Melongena sculpturata Dall, E. 

 Latirus floridanus Heilprin, F. 

 Solenosteira inornata Dall, B, C, D. 

 Busycon spiniger Conrad, var., B, F. 

 Busycon stellatum Dall, A. 

 Fusus sp., C, D. 

 Fusus (Papillina) dumosus Conrad, var.? 



A, B, C, D, E. 

 Cypraea Heilprini Dall, C, D, F. 



Strombus albirupianus Dall, J. 



Cerithium georgianum Lyell and Sowerby, 

 B, J. 



Cerithium platynema Dall, B, J. 



Cerithium n. sp., J, also at Wakulla, 

 Florida. 



Potamides hillsboroensis Heilprin, B. 



Potamides (Pyrazisinus) cornutus Heil- 

 prin, B, J. 



Potamides (Pyrazisinus) acutus Dall, B, 



J. 



Potamides (Pyrazisinus) n. sp.? J. 



Bittium sp. ? B, F. 



Modulus turbinatus Heilprin, J (also silex 



beds). 



Turritella tampse Heilprin, J, F. 

 Turritella (near megalobasis Dall), A, C, 



F. 



Turritella sp., C, D, E, F, J. 

 Calyptraea trochiformis Lamarck?, J. 

 Amalthea sp., J. 

 *Xenophora conchyliophora Born, B, C, J 



(X. humilis Con.). 

 Ampullina streptostoma Heilprin, A, C, D, 



F, J- 

 Ampullina amphora Heilprin, B. 



