230 Xew Species of Fossils froiii Ohio. 



measures of lowii, is described as "rather small, tinely punctate, 

 smooth, except somewhat strong- concentric lines of growth 

 toward the margins. Upper valve modei'ately convex, umbo 

 oblique, nearly central. Lower valve moderately concave." 

 There would appear to be some similarity between the npper 

 valves of this and the Ohio species ; but the remark concerning 

 the lower valve being' " moderately concave" thi'ows considera- 

 ble doubt on their identity, as the lower valve of this species is 

 attached over its entire surface, Avhile that one would apijear to 

 be free or partially free, if it is a Crania. 



Fonnation and Locality.— li\ the Coal-measures of Carbon 

 Hill, Hocking Co., Ohio. Collected by H. Moores, Esq.. of 

 Columbus, Ohio. 



GASTEROPODA. 

 \atieoi)si$ Ortoni, n. sp. 



Pal. O., Vol. Ill, Plate 13, Figs. 12 aud 13. 



Shell small, with a somewhat depressed conical spire, which forms nu 

 angle of about 105 degrees, and the two and a half to three volutions are 

 obliquelj'^ flattened on their upper side, in the direction of the spire ; the 

 outer one being marked just below the suture by a barelj^ perceptible con- 

 cave channel of considerable width, which produces a very slight angularity 

 of the upper part of the volution. Suture-line slightly grooved. Lower 

 side of the volution rounded ; umbilicus closed ; callus slight ; aperture ob- 

 liquely ovate at the outer margin, but rounded within from the excessive 

 thickening of the shell. Surface of the shell marked by fine, rather equal 

 and somewhat regular transverse strise of growth, most distinctly marked on 

 the lower half of the volution. On the outer half of the last volution, there 

 occur lines of nodes, very faintly indicated, having a direction opposite to 

 the growth-lines, and becoming fainter and finally imperceptible toward 

 the lower side. 



The species resembles N. nana, M. & AV. (Geol. Rejot. His., 

 Vol. Ill, p. 365, pi. 32, fig. 4), in size and general form, but 

 differs from it in the greater flattening of the volution in the 

 direction of the spire, and in the faintly nodose surface. 



Formation and Locality. — In a thin cherty band of the Coal- 

 measures in the railroad cutting at Mrs. Banks" farm, Falls 

 Township, Hocking Co., Ohio. 



