NAPLES FAUNA IN WESTERN NEW YORK, PART 2 429 



Genus belierophon Montfort 



Page 320 



Belierophon koeneni sp. nov. 



Page 320 



12-14 Views of a replacement in barite, partially incomplete but 

 showing contour and external characters. x2 

 Naples subprovince 



Genundewa limestone, Canandaigua lake 



15 Dorsal view of an old example showing the reappearance of 



concentric lines about the later parts of the shell. X2 



16 Exterior of an adult shell, a replacement 



17-20 Replacements exposing the inner whorls, the first three 

 showing the gradual assumption of the tuberculous ornament, 

 and all enlarged X2 ; except figure 18 which is xio and 

 shows the fine concentric lines which precede the appearance 

 of the tubercles. 



21, 22 Dorsal and side views of a small individual. X2 

 23 Another young shell. X2 



Naples subprovince Genundewa limestone, Middlesex 



Belierophon denckmanni sp. nov. 



Page 321 



24-26 Views of a replaced shell. X5 



Naples subprovince Genundewa limestone, Middlesex 



27, 28 Dorsal views of two individuals. X5 



Naples subprovince Genundewa limestone, Bristol 



