284 SYSTEiiATic Palkoxl'ology — Middle Devonian 



smooth intenial impression ' of this species and further agree in having 

 a less elevated spire tlian F. t^ulcomarginaia. On a portion of the body- 

 wliorl one specimen has preserved the surface markings, fine and close 

 striae parallel to lines of growth like those of P. roialia; while there are 

 no indications of revolving striae. It is thought that the low spire and 

 fine concentric striae, which are the two most distinguishing characters 

 of P. rotalkt, are sufficient evidence for referring these specimens with a 

 question to this species. 



Length, not shown; width, 12-19 mm. 



Occurrence. — Komney Formation, Hamilton Member. McCoys 

 Ferry; southwest of McCoys Ferry; National Eoad \ mile west of Tonolo- 

 way Eidge ; in Jennings Eun \ mile west of Corriganville ; Ernstville. 



Colhction. — Maryland Geological Survey. 



Subgenus EURYZONE Koken 



Pleurotomaria (Euryzone)itys Hall (?) 

 Plate XXXV, Figs. 11-12 



Turbo lineatus Hall, 1843, Geol. N. Y., pt. Iv, p. 198, fig. 1. 



Pleurotomaria lineata Hall, 1861, Descriptions of New Species of Fossils, p. 



16. 

 Pleurotomaria lineata Hall, 1862, Fifteenth Rep. N. Y. State Cab. Nat. Hist., 



p. 44. pi. V, fig. 3. 

 Pleurotomaria itys Hall, 1S76, Illustrations of Devonian fossils: Gasteropoda, 



pi. 20. 

 Pleurotomaria itys Hall, 1879, Pal. N. Y., vol. v, pt. ii, p. 76, pi. xx, fi?s. 8-17. 

 Pleurotomaria itys Keyes, 1891, Johns Hopkins Univ. Giro., vol. xi, p. 29. 

 Pleurotomaria itys Clarke, 1903. N. Y. State Mus., Bull. 65, p. 556. 

 Euryzone itys Grabau and Shimer, 1909, N. Am. Index Fossils, vol. i, p. 645, 



fig. 879e. 



Description. — "Shell turl)inate; spire ascending, higher than wide; 

 volutions four or five, regularly and evenly convex, gradually expanding 

 to the body-whorl, which is vcntricose, rounded below and concave in the 

 middle; umbilicus small or none; aperture broadly oval, somewhat higher 

 than wide. Surface marked by strong, regular, revolving striae on the 

 upper and lower sides of the volutions, crossed and cancellated by fine, 



^ hoc. cit., vol. v, pt. ii, pi. xix. 



