705 



Pleu. 



Acad. Nat. Sci. Phila. Vol. 8, Trenton and Hudson river for- 

 mations. Hall., Pal. N. Y. Vol. 1, 1847, page 305, plate 83,lig. 

 4 a^ small, showing back of spire and expansion of last whorl; 

 J, enlarged surface to show alternating larger and smaller 

 carinas (keels) crossed by the oblique fine striae; c, larger 

 specimen; ^, another with aperture entire on the outer mar- 

 gin ; g, base. Resembles P. Ucarinata of the Trenton forma- 

 tion^hMt differs essentially in having the whorls an gulated only 

 on the center. It is also always shorter than the Trenton P. 

 uniungulata. It is found in the higher beds of the Hudson 

 river shale at Turin and Rome, N. Y.— Reported found in 

 Pennsylvania by H. D. Rogers, Geol. Pa. 1858.— Z/7 J. 



Pleurotomaria bonharborensis, Cox, Geological Survey 

 ^ii,:f^ ^ of Kentucky, Vol. 3, page 567, plate 8, fig. 4, 

 Ccx. •^'is-^'J^t^ enlarged; 4 a, natural size. Abundant in the 

 roof shales of the Bonharbor coal No. 11, 

 ^^ ^,^ ^-» Davies Co., Ky. Upper coal measures XY, 



Pleurotomaria calcifera, Billings. Geology of Canada, 



1863, page 117, fig. 27 a, the 

 usual form of the shell; 27 

 5, a variety with the spiral 

 depressed ; 27 c, view of the 

 spiral. Calciferous sand- 

 stone, II a, 



Pleurotomaria calyx, Billings. Geology of Canada, 1863, 



page 132, fig. 62 

 a>, view of the 

 spiral ; 62 J, side 

 view ; <?, smaller 

 specimen. Cha- 

 zy limesto ne, 

 III, 



Pleurotom.aria capillaria, Conrad, Jour. Acad. Nat. Sc. 

 vni c 2 Phila. 1842,Vol. 8, p. 271, pi. 16, fig. 11.— Hall, Pal. 

 H/i//^^^ N. Y. Vol. 5, part 2, pi. 70, figs. 18 to 21; 15th 

 Annual Report, New York, p. 45, pi. 5, fig. 2; 

 from the Hamilton coarse shales. (A similar but 

 ^- slenderer and more closely striated variety is 



