436 NEW YORK STATE MUSEUM 



PLATE 20 



Genus peeurotomaria Def ranee 



Page 316 



Pleurotomaria genundewa sp. nov. 



[See pi. 19] m 



Page 319 



1-7 Various views of this species showing the limits of variation in 

 the character of the exterior. All enlarged X5 except fig- 

 ures 1 and 5 which are X3. 

 Naples subprovince Genundewa limestone, Middlesex 



Pleurotomaria ciliata sp. nov. 



Page 318 



8-14 A series of views showing the expression and variations of the 

 shell. X5 

 Naples subprovince 



From the concretions in Whetstone gully, Conesus lake 



Genus frotospirialis gen. nov. 



Page 340 



Protospirialis minutissima Clarke 



Page 340 



15-19 Various views of these tenuous and smooth shells enlarged to 

 5 diameters 



Naples subprovince Barite replacements 



from the calcareous concretions of Honeoye lake 

 Genus tentacueites Schlotheim 



Page 342 



Tentaculites tenuicinctus A. Roemer 



Page 343 



20 A specimen enlarged 10 diameters 



2 1 A still greater enlargement to show the character of the 



annulations 

 Naples subprovince 



In the arenaceous concretions at Naples 





