719 



Pleu, 



VIl/c I 



PleuTotomaria thalia. See Cyclonema thalia. 



Pleurotomaria trilineata. Hall. Trans. Alb. Inst. Vol. 4, 

 .^g^l856, Whitfield, Bull. 3, Am. Mus. Nat. 

 Hist. N. Y. 1882, pi. 9 fig. 20, enlarged three 

 times ^ type specimen. Somewhat resembles 

 Cyclonema {Pleurotomaria) leavenworth- 

 ana^ but cannot be mistaken for it except 

 in casts; distinguished by the revolving 

 r/. SiC^ grooves on lower part of shell. Spergen 

 Hill, etc., Ind. Subcarhoniferous. — XL 



Pleurotomaria trilix, Hall. 15th Annual Report of N. 

 •^ . Y. 1862, p. 45, pi. 5, fig. 1 ; a distinct keel on the last 

 whorl just below the sutuie; periphery has three 

 keels inclosing two depressed bands on which the 

 concentric striae are abruptly bent backwards from 

 the aperture. Imperfect specimens, but species 

 readily distinguished. Seneca lake Hamilton shales. In Penn- 

 sylvania, Perry Co., Olaypole's Coll. Spec. 5-12, from Barnett's 

 mill, outcrop of Hamilton upper shale; Spec. 74 C-12 (two), 

 from the same outcrop along Soap Hill between N. Bloomfield 

 and Newport ; and Spec. 99-12, from Drumgold's tanner}^ on 

 Sherman creek. — VIIIc. 



Pleurotomaria {Scalites?) tropidophora, Meek. Amer. 



1116-. 6^ ^. .. ^^"^- ^- ^^^ ^' t^^ ^^^^' ^' 



1872, Cincinnati group. Pal. 



Ohio, Vol. 1, 1873, page 154, 

 plate 13, figs. 6 a^ J, c^ enlarged 

 two diameters, A shell having 

 s^me of the characters of both 

 Pleurotomaria and of Scalites, It has no trace of the revolv- 

 ing band, but its growth lines have the strong oblique back- 

 ward curve of Scalites, etc. Diff'ers from P. selecta of Bil- 

 lings. Hiidson river strata at Cincinnati. — III h. 

 Pleurotomaria tumida. See Platystoma tumidum. XIIP 

 Pleurotomaria turbinella, reported by I. C. White from 

 the Ferriferous limestone {Allegheny coal series) at the quar- 

 ries, south bank of Ohio river, below Eaccoon, Beaver Co., Pa. 

 (K, 346 ; Q, 62) ; also Lawrence Co. (Q2, 47, 106) ; also Mercer 

 Co. (Q3, 25; V, 147).— X///. 



