92 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



POTAMIDES (PYRAZISINUS) CAMPANULATUS HelTprin. 



Plate 13, figs. 15, 18. 



Potamides {Pyrazisirms) campanulatus Heilprin, Trans. Wagner Inst., 

 vol. 1, p. 115, pi. 16, fig. 59, 1887.— Dall, Trans. AVagner lust., vol. 3, 

 pt. 2, p. 288, pi. 11, figs. 10, lOo; pi. 15, figs. 2, 6, 10, 1892. 



Tampa silex beds at Ballast Point, Tampa Bay, very common, 

 Wilcox, Shepard, Dall, and Bm-ns; also in residual clay at Baileys 

 Mill Creek sink, three-quarters of a mile northeast of Lloyds, Jeffer- 

 son County, Florida; L. C. Johnson. IT. S. Nat. Mus. No. 165108. 



The species varies in size a good deal, at the adult stage, and also in 

 the strength of the spiral sculpture, Avhich is usually most pronounced 

 in front of the suture. The varix is often very prominent but the 

 transverse ribs are never as strong and square as in P. scalatus or P. 

 cornutus. 



POTAMIDES (PYRAZISINUS) CORNUTUS Heilprin. 



Plate 8, fig. 1. 



Cerithium cornutum Heilprin, Trans. Wagner Inst., vol. 1, p. 124, pi. 8, fig. 



68, 1887. 

 Potamides (Pyrazisinus) cornutus Dall, Trans. Wagner Inst., vol. 3, pt. 2, 



p. 288, pi. 15, fig. 3, 1892. 



Tampa silex beds at Ballast Point, Florida, very rare; also, as 

 molds, in the overlying Orbitolite limestone near Tampa City, and 

 in the limestone of the Pithlachascotee Eiver, Willcox and Heil- 

 prin, and in Wakulla County, Florida, Burns. 



This species was originally described from a pathologic specimen 

 which had been injured and formed an irregular double mouth, the 

 projecting lip of which suggested the specific name. This will be 

 evident on an inspection of the figure. A somewhat analogous 

 species P. scalatus Heilprin (as Cerlthidea) occurs in the Florida 

 Pliocene, and another in the Oligocene of Santo Domingo. The type 

 is in the collection of the Philadelphia Academy of Natural Sciences. 



POTAMIDES (PYRAZISINUS) ACUTUS Dall. 



Potamides (Pyrazisimis) actttus Dall, Trans. Wagner Inst., vol. 3, pt. 2, 

 p. 289, pi. 22, fig. 19, 1892. 



Tampa limestone overlying the silex beds at Ballast Point, Tampa 

 Bay, and along the Hillsboro River emptying into the Bay, Dall. 

 Found in the form of molds from which a gutta percha cast was 

 made. 



I have included this reference because the relation of the lime- 

 stone and the silex beds is so close that it may eventually prove to be 

 found in both, like many other species. The species is shorter and 

 more acute than either of the others, with a remarkably produced lip. 



