Platyc. 666 



species the apex projects beyond the base a distance nearly 

 equal to half the diameter of aperture. Chemung VIII g, 



Platyceras capax, Keysr American Philosoph. Soc. Phila. 

 Xl...^^ /A ^, 25 Vol. 25, No. 128, p. 242, fig. 



*' -^- 14. Subcarhoniferous lime- 



stone. XI. 



Platyceras carinatum, Hall. 15th. An. Et. 1862. Upper 

 Helderherg. — In Pennsylvania collections, Cat. 000, and 

 Olaypole's Report F, 2, preface ; Specimens 5-44 (and a cast of 

 it) ; 5-45; 5-86; 216-7-8. Spec. 801-16, in Chance's coll. on 

 Marshall's creek. IIamilt07i^ VIII c, — See Appendix. 



Platyceras chesterense. See Pteratocrinus acutus. 



Platyceras ( Orthonychia) conicum, Var. chemungense, 

 new variety., Simpson Trans. A. P. S. Phil. Dec. 1889, founded 

 on 9471, 9504 of Randall's coll. at Warren, Pa.— VIII g. 



Platyceras conicum, var. inflectum, reported by I. C. 

 White, among the forms at Mapleton, Huntingdon Co., Pa., in 

 beds below the middle of the Oriskany sandstone. (T3, p. 

 119.) See cat. 000, 1888, p. 57, spec. 200-9 (four).— F/Z. 



Platyceras conicum, var. inornatum, Mapleton, Pa. 

 Oriskany sandstone. (T3, 119) Spec. 200— 7 (two).— F//. 



Platyceras cymbium. Hall, 15th An. Rt. 1862, Upper Hel- 

 derberg.— Found in Monroe Co., Pa., Chance's collections on 

 Marshall's creek, in "- Hamilton strata^'^ VIII c. 



Platyceras dumosum Figure with P. undatum. 

 Platyceras dorsale, Simpson. New species. Trans. Am. 



Phil. Soc, Phila., 1889. 



/ 



m 



page 454 .fig.24,1 side view; 

 1% fig. 2, dorsal view ; based 



upon Randall's specimen 

 9504 B, of his collections 

 near Warren, Pa. — Shell 

 obliquely subcorneal ; an- 

 terior side curved; pos- 

 terior straight or concave; 

 apex not incurved, later- 

 A.P.S. Tr.13-83. — ■- ^' ^^iiiipi' ^]]y compressed'; body of 



mm 

 mm 



^^ 



-S 



\\^ 



