148 



Report of the State Geologist. 



PLATE III. 



Manticoceras oxy, sp. nov. 



(See Plate II.) 



Figure 1. A sculpture cast of the body whorl of a large shell, believed to 

 be of this species. It retains a considerable part of the aperture and 

 shows it to have possessed a broad auriculate expansion, blunt at 

 the extremity. The surface shows a few broad lateral undulations 

 of surface ornament. To the internal surface of this body chamber 

 were attached numerous Orbiculoideas whose shell substance is partly 

 retained while that of the goniatite has been entirely removed. 

 From the higher Portage sandstones on East hill, Naples. 



Figures 2 and 3. A 'fragment of what must have been a very large individual 

 of this species ; showing the carinate venter and the extreme curva- 

 ture of the ventro-lateral lobe and saddle. 



From the upper sandstones of Caulkins gully, Naples. 



Figure 4. A fragment of M. Paitersoni or M. oxy which shows the extreme 

 effect upon the aspect of the sutures, of maceration before or 

 secondary changes after fossilization. Specimens of this kind occur 

 frequently upon the thin flagstones and show every variation in the 

 form of the suture from the extreme here presented to the normal 

 Pattersoni suture. In this example nearly one-half the diameter of 

 the whorl lias been removed, and the unusual breadth of all lobes 

 and saddles is thus explained. Upon a specimen whose suture 

 curves had been broadened by such a process w as based the species 

 Goniatites sinuosus, Hall, taken by Hyatt as the type of the genus 

 GrEPHYROCEBAS. 



From the sandy slabs at Naples, N. Y. 



