Clarke — The Naples Fauna. 



151 



Manticoceras Pattehsoni, Hall (sp.). 



(See Plates I and II.) 



Figures 14 and 15. Fragments of adult shells, showing the character of the 

 ornament and the strong hyponomic curve. Figure 14 is from a 

 specimen from Rock Stream, Yates county: figure 15, from Naples. 



Figure 16. Front view of the ephebic shell represented in figure 10, plate I. 



Figure 1 7. An adult specimen from a calcareous nodule at Naples, which 

 shows very faint nodes near the umbilical margin of the final whorl. 

 They are actually less conspicuous than here represented, but they 

 show the possible derivation of a nodose surface from the phases 

 of ornament through which the shell passes. 



Figure 18. A fragment with the Patterson i suture in a progressed condition ; 

 from the Chemung formation at Elmira. 



