Plbu. 706 



found in the Upper Helderlerg limestone Villa), VIIlc. — In 

 Pennsylvania, found by Olaypole, see preface to F. 2, in Ham- 

 ilton, VIIIc—Gdit 000, p. 239, Spec. 872-40 from Nichols, 

 Tioga Co., N. Y. Chemung^ closely resembles one of Hall's figs. 

 See Olaypole's catalogue (in 000) specimens 2-8, from Oomp's 

 mill, near N. Bloom., Perry Co. ; 5-3,-13,-19 (three), -42 from 

 Barnett's mill. Perry Co. 518 29, from Dorrari's narrows, Centre- 

 town, Perry Co. ; 196 17, from Rough and Keady, Huntingdon 

 Co. (See T3, p. 109) all in Hamilton upper shale. At Cove 

 Station, in Hamilton bottom heds (T3, 111). — VIIIc. 



rieurotomaria carbonaria, Norwood and Pratten, J. A. 

 Nat. Sci. [2] Vol. 3, 1854. Goal measures. — In Pennsylvania 

 reported by White in the Ferriferous limestone and under- 

 shales (Allegheny series), in N. Sewickley township Beaver 

 Co. (Q, 62, 205); in Lawrence Co. (Q2, 47, 106); in Mercer 

 Co. (Q3, 25). Also by Stevenson, in the Decker'* s creek shale^ 

 under the Mahoning sandstone, at Morgantown, W. Va. (See 

 L, 37.) — Also by W. S. Piatt, in the Black fossiliferous lime- 

 stone of the Barren measures, Indiana Co. (H4, 78.) See also 

 K3, 310.— X///, XIV.— See Appendix. 



Pleurotomaria concava. See Eotrochus concavus. — XI, 



Pleurotomaria coniformis. (P. conoides., Meek & 



^. , ^ Worthen, Proc. Acad. Nat. Sci. Phila. 



' ^'"^ .M}"- 1866); M. & W., Geo. Sur. 111., Vol. 5, 



■Gpoi. ^^^^^^ side view: J, opposite side and aper- 

 ^'*^* ' ' ture ; c, enlarged to show the surface 



markings and the spiral band. Differs from the rest of the 

 trochiform group (P. riddellii., turiiniformis, missouriensis 

 and ohtusispira by its smallness, and from all but the last in 

 wanting revolving strip on upper side of whorls. Same of 

 Trochus coniformis.JieKonmck. From the Lower coal measures 

 of Illinois. — Eecognized in the Pennsylvania bituminous coal 

 measures by J. J. Stevenson. (K3, p. 310).— Z//Z 



Pleurotomaria {Murchisonia ?) conula. Hall, Trans. Alb- 

 Xl^|^^^7. Inst. Vol. 4, 1856.— Whitfield, Bull. 3, Amer- 

 " >jv Mus. N. H., N. Y., 1882, pi. 9, fig. 18. CoUett's 

 P^l*'*^ Indiana Rt. 1882, p. 258, pi. 32, fig. 17), mouth 

 l^^.trB^Z. 32 ^^^ ^^^^ shown in the most perfect specimen, 

 enlarged four times; quite distinct from all other species by its 



