Clakke — The Naples Fauna. 



157 



Gephyroceras ? (Probeloceras ?) Holzapfeli, sp. nov. 



Figure 17. A pyritized specimen, showing the character of the sutures, x 2. 

 Naples shales, Eighteen-mile creek, Erie county. 



Probeloceras (?) Naplesense, sp. nov. 



Figure 18. A mature shell, showing a portion of the sutures. 

 From the shales at Naples. 



Sandbergeroceras syngonum, sp. nov. 



(See Plate VI.) 



Figure 19. A portion of the inner whorls, showing the large number of 

 volutions, the wide umbilication and the character of the ornamen- 

 tation, x 2. 



From the shales at Naples. 



Figure 20. A specimen from the bituminous slaty shales of the lower black 

 band at Naples. This is the specimen referred to in Bull. No. 16, 

 U. S. Geol. Surv., p. 51, 1 865. 



