DESCRIPTION OF SPECIES * 253 



Pleurotomaria newportensis White 



1880 Pleurotomaria newportensis. White, Cont. to Pal., No. 8, p. 169, PI. 42, Figs. 



2a, b. 



Coal Measures: Newport, Indiana. 

 1887 Pleurotomaria newportensis ? Herrick, Bull. Den. Univ., Vol. 2, p. 21, PI. 2, 



Fig. 18. 



Coal Measures: Flint Ridge, Ohio. 



Remarks. A few crushed specimens of evidently the same form 

 which Herrick referred to as Pleurotomaria newportensis ? were found 

 among the collections of Lower Mercer and McArthur fossils. The 

 somewhat macerated condition of the shells, however, renders the 

 identification with White's species uncertain. The form undoubtedly 

 belongs to the same general type of shell as P. carbonaria but differs in 

 having the slit band raised as in White's species. It seems probable 

 that P. newportensis represents one of the various phases of P. carbonaria 

 and constitutes a variety of that form rather than a distinct species. 



Horizon and locality. Lower Mercer limestone: Muskingum 

 County, Locality 36, r; Licking County, Flint Ridge, Locality 49, r; 

 Stark County, Locality 53, r. McArthur limestone: Vinton County, 

 Locality 84, r. 



Pleurotomaria ornatiformis n. sp. 

 PL XV, figs 7-13 



Description. Shell small, height a little less than width; volutions 

 five or six in number, the last forming about two-thirds the height of 

 the shell. Volutions moderately convex, angular, and shouldered, 

 marked centrally by a relatively broad, flat zone bounded by two 

 prominent revolving carinae; slit-band situated on the central zone 

 between two smaller carinae; region between the shoulder and the 

 central flattened area slightly concave, marked by three or four revolv- 

 ing carinae; region below the slit-band on the last volution convex, 

 marked by numerous closely arranged carinae; surface also marked by 

 fine, transverse, thread-like lines which turn backward above and for- 

 ward below the slit-band. Aperture unknown. 



Dimensions. As these specimens occur as external impressions, 

 most of them very fragmental, exact measurements cannot be given. 

 However, judging from the material studied, the dimensions of a typical 

 individual are approximately: height of shell 7 mm., height of body 

 whorl 4.5 mm., width of last volution 9 mm. 



Remarks. This species is very similar to P. gurleyi Meek and 

 Worthen, but can be distinguished by the difference in the position of 

 the slit-band. In P. gurleyi it is situated upon or just above the mesial 



