288 TRANSACTIONS OF THE WAGNER FREE 



ing up which unite the different groups into which the great army of Cerites 

 has been divided. 



Potamides (Pyrazisinus) campanulatus Heilprin. 

 Plate II, figures lo, lo a ; plate 15, figures 2, 6, 10. 



Potatnides {Pyrazisinus) companulatus Heilp., Trans. Wagn. Inst. i. p. 115, pi. 16, fig, 59, 

 1887. 



Older Miocene of the Orthaulax bed at Ballast Point, Tampa Bay, 

 Florida, Willcox, Shepard, Dall and Burns; also at Bailey's Mill Creek sink, 

 three-quarters of a mile northeast of Lloyds, Jefferson Co., Florida, in a re- 

 sidual clay, L. C. Johnson. 



This species varies very much in adult size, and also in the strength of 

 its transverse sculpture ; at the junction of the outer lip with the body it is 

 prolonged upward, callosified and faintly grooved in the middle of the cal- 

 lus, in fully mature specimens. The principal varix is at the end of the first 

 half of the last whorl, and it is often very prominent. The spiral grooving 

 tends to be strongest in front of the suture. I have seen no specimens with 

 transverse ribs as square and prominent as in P. cormiUis or P. scalattis. 



Potamides (Pyrazisinus) cornutus Heilprin. 

 Plate 15, figure 3. 

 Cerilhium coriiutuiii Heilp., Trans. Wagn. Inst. i. p. 124, pi. 8, fig. 68, 1S87. 



Older Miocene on the Pithlachascootie River, Florida, Willcox ; Orthau- 

 lax bed at Ballast Point, Tampa Bay, Florida, rare, Dall; also in the form of 

 molds in the Orbitolite bed, or Tampa limestone, near Tampa City, over- 

 lying the Orthaulax bed, Dall. 



Only one specimen of this species was obtained by Mr. Willcox, and 

 that is in a very imperfect condition. I removed it from the limestone in 

 which it was partially imbedded, and it proves to belong to the same group as 

 P. campanidaUis. A new figure has been made of the type-specimen. This 

 specimen, after forming its outer lip, during life suffered a fracture, and, as is 

 often the way in such cases, formed a second lip, somewhat abnormal in 

 form. In the figure, b shows the posterior extreme of the original normal lip, 

 while a is the fractured end of part of the second lip, or " horn " of Heil- 

 prin's description. The specimen is a much-worn siliceous pseudomorph 

 with much of the last whorl destroyed. The specimens from Ballast Point 

 show about ten oblique, strong transverse ribs, with the whorl behind con- 

 stricted between them and the suture; the spiral grooving extends to the 

 suture as in P. scalatus. The varix is extremely prominent. The shell, from 

 the scant material obtained, seems intermediate between P. campanulattts and 

 P. scalattis. The molds in the Tampa limestone afforded some barely recog- 

 nizable casts in gutta-percha. 



