Platyc. 



664 



i^n 



Platyceras acutirostre. ( Capulus acutirostris^ Hall,Trans. 



Alb. Inst. Vol. 4, 1856, Iowa Rt. 

 1859, pi. 23, fig. 14. Whitfield, 

 Bull. 3, Amer. Mus. 1882, pi. 8, 

 figs. 13, 15,) Collett's Indiana Rt. 

 L,,^§ 1882, p. 370, pi. 31, figs. 13, 15. 

 f:^ .... -^j Subcarboniferous forma- 

 tions at Spergen Hill, etc. In- 

 diana. — Recognized, doubtfully, by Heilprin among the an- 

 thracite black shale fossils of the Wilkes-Barre neighborhood, 

 owned by the Wyoming Hist. Soc. See Geol. Sur. Pa. An. Rt. 

 1885, p. 451.— XIII. 



Platyceras attenuatum, (? P. dumosum^ Conrad.) Hall, 

 VIM tf<.. * *> I ^^>.. 13th Re- 



gents' Rt. 

 1859; 15th 

 Re p o r t , 

 1862, p. 

 19. — 

 Meek 's 



Zh f 





TaL Ohio . Vol X, /y:xx . species, 

 with same name, was described in Proc. Acad. Nat. Sci. Phila. 

 1871, p. 75. Also in Pal. Ohio, Vol. 1, 1873, page 212, plate 20, 

 fig. 2ci^ internal cast, showing little nodes which occupied depres- 

 sions on the inner surface of shell corresponding [this however 

 is Meek's species; different from Hall's] to the cases of spines on 

 its unknown outside surface ;^2b, another cast. A peculiarity of 

 the shell, the twisting-^f the apex nearly at right angles side- 

 wise, distinguishes it from P, domosum. It resembles the 

 non-spiny P. reilexum of the Oriskany sandstone, Columbus, 

 O. Corniferous limestone. VI II a, — In Pennsylvania collec- 

 tions. Cat. 000, Claypole's spec. 5-75, 94-45, 198-10-12. 

 Platyceras bisulcatum. Hall, Palaeontology of New 



York, Vol. 3, 1859, p. 310, fig. 4, from 

 the Loiuer^Helderherg formation in New 

 York. — VL [In Pennsylvania, C. E. 

 Hall names it in his MS. report of col- 

 p lections, Dec. 30, 1876, from Marcellus 

 and Hamilton strata. — Vlllh. o.l 



