432 NEW YORK STATE MUSEUM 



PLATE ig 



Genus protocalyptraea Clarke 



Page 339 



Protocalyptraea marshalli Clarke 



Page 339 



1-3 Views of the original specimen, the shell being somewhat 

 restored to its normal outline ; a barite replacement. X3 

 Naples subprovince Whetstone gully, Honeoye lake 



4-6 Sculpture casts from the shales, showing the spiral suture. X2 



Protocalyptraea styliophila Clarke 



Page 339 



7, 8 Two views of the original specimen showing the internal course 

 of the whorls. X2 

 9 Surface of the same enlarged to show the concentric striae. X5 

 Naples subprovince 



Genundewa limestone, Canandaigua lake 



Genus diaphorostoma Fischer 



Page 337 



Diaphorostoma lutheri sp. nov. 

 10 An internal cast representing a shell apparently malformed 



in having the periphery of the final whorl strongly 



indented, xi.5 

 14 The exterior of an associated shell showing the general aspect 



and elevation of the whorls, xi.5. The final whorl in this 



species is full and rotund but less so than inD. rotunda- 



tu m and the spire is higher. 



Naples subprovince Naples 



Diaphorostoma (Naticopsis; rotundatum sp. nov. 



Page 337 



1 1 — 1 3 Three views of the exterior showing the inflated body whorl 

 and the very low spire. X3 

 Chautauqua subprovince Angola 



