Plec. 



696 



{figure of Platy stoma trigonostoma,) 



Fa/.OhioyijlJ:.nafe Xv/ . 



Platy stoma tum^idum, 

 villense. XIII. 



See P. grey- 



MsllJstk rR 



Platystoma turbinatum. Hall. 14th 

 An. K. N. Y. 1861, pa^e 106. Figure 

 from 15th An. Rt. 1862, plate 5, fig. 18. 

 pt ^ Upper Helderherg formation, VIII a. 



Platystoma unisuleatum, {Pleurotomaria unisulcata^ 

 Oonrad, 1842 J Hall, Pal. Vol. 5. Villa. 



Platystoma ventricosum, Oonrad. Journal of Academy of 



Nat. Sciences, Phila. Vol. 

 8, 1842,Z^2^76r Helderherg, 

 Figure borrowed from 

 Geology of Canada, 1863, 

 page 962,fig. 472, assigned 

 to the Oriskany forma- 

 tion. — In Pennsylvania 

 collected by 0. E. Hall 

 W from Royers' ridge near 

 Orbisonia, Huntingdon, 

 Co. Report 000, p. 209, spec. 703-12. Also, by White, at 

 Mapleton in the sand quarries (T3, p. 119). Also, in Bedford 

 Co. they crowd a layer of sandstone, 142' below the top of the 

 Oriskany formation^ at Hyndman on Will's creek, and are 

 abundant at the south side of Bedford Springs (T2, p. 86, 104, 

 148).— F/; VII 



Plecia similkameena, Scudder. An insect found in the 

 rema^^^^^ lose Miocene {?) tertiary heds of British Columbia. 

 Fig. 1086 (f size) in ZittePs Handbuch— i/^d)- 

 Gene. 



