DESCEIPTIONS OF SPECIES. 475 



it is upon a much smaller scale, the strii^?. both revolving and transverse, being finer 

 and consequenth' more numerous. The statement that in this species the transverse 

 strisB do not cross the slit band is certainly erroneous. In some specimens, owing 

 apparently to abrasion, they are partially removed on this portion of the shell,' but 

 in genei'al they seem to be about as prominent on the slit band as over the more 

 lateral areas. It is possible that P. hellion, which was obtained from Kansas City, as 

 was also /'. textillforme. may belong to "the same species. In that case the form 

 from Rulo and the present material would represent an undescribed form. 



The surface of the form from the Rico formation, to which reference has been 

 made above, is more like that of P. helium than of the other American species I have 

 seen, and if it proves to be different from P. hellvm, as seems likely, it is probably 

 a new variety. 



Locality and horizon. — San .1 uan region (stations 2217, 2337, 2340) ; middle portion 

 of the Hermosa formation and in the Rico formation. 



EUPHEMUS McCoy, ISti'J, emend. Waagen, 1880. 



EUPIIEMUS NODOCARINATUS Hall. 



1858. Bellerophiin iiodociirinatux. Hall, Genl. Snrv. Iitwa, vol. 1, pt. 2, p. 723, pi. 29, figs. 1.5a-c. 



(loal Measure?: Illinois and Iowa. 

 1884. IScUeropIion noihiriiriiKitnx. White, (ieol. Surv. Indiana, loth Kept., p. 1.59, pi. 33, tigs. 3-5. 



Coal Measures: New Harmony, Ind. 

 188H. BdlfTophoii iiixlocariniihi.i.' Heiljirin, 2d (teul. Surv. Pennsylvania, Ann. Rept. for 1885, p. 457, 

 fig. 13. 



Upper Coal Measures; iMill Lreek limestone, Wilkesbarre, Pa. 



1886. Belkrophoii nodororinfilnx.' Heiljirin, Prnc. and Coll. Wyoming Hist, and Geol. See, vol. 2, 



pt. 2, I). 277, fig. i:i 

 Upper Coal Measures; .Mil! Creek limestone, Wilkesbarre, Pa. 



1887. Belleroplioii. nodocurinaln.-i. Herriek, Sci. Lab. Denison I'niv., Bull., vol. 2, p. 18, pi. 3, fig. 3. 

 Coal Measures; Flint Ridge, Ohio. 



1895. Bellerophnn aodocarinatus. Keyes, Missouri Geol. Surv., vol. 5, ji. 152, jjl. 50, figs. 4a-c. (Date 

 of imprint, 1894.) 

 Upper Coal Measures; Kansas City, Mo. 

 1897. T'jupliemun nodocarinaiiix. Ulrich, Geol. Nat. Hist. Surv. Minnesota, Final Rept., vol. 3, pt. 2, 



p. 855. 

 1899. Eaplirmiix iiiidiiriiriiiutii.i. Girty, V. S. Geol. Surv., Nineteenth Ann. Rept., pt. 3, p. 592. 



With the exception ot stations 2340 and 2344 in the Rico formation, the 

 specimens which 1 have referi-ed to En. nodocarinatns are preserved as internal 

 ca.sts. Even thosi> which show the characteristic revolving striae are not sufBcientlj^ 

 complete so that I am able to determine whether they are strictly identical with Eu. 

 cnrhonarlux. with En. xuhpapilloHnx. with En. innpeciostis, or with Eu. nodocarinatvAs. 

 Of the casts, some specimens represent, perhaps, j^oung examples of BeJlei'ophon 

 crasmi^. 



