DESCRIPTIONS OF SPECIES. 455 



ber of rather coarse revolving ridges. The underside of the shell, moreover, is 

 somewhat strongly concave, while that of Eu. iicarinata is generally convex 

 Locality and horizon. — San ,Tuan region (station 2340); Rico formation. 



EUCONISPIRA sp. }>. 



This species is derived from the same localit}' and horizon as the jjreceding. It 

 attains a rather large size, and is distinguished from the other members of the genus 

 noted here by the lowness of its spire and the rapidity of its expansion. The largest 

 specimen seen has a diameter of 45 mm. One whose diameter is 28 mm. has a 

 height of probably not over 15 mm. The base is concave. The surface ornamentation 

 is entirely obscured. 



Locality and horizon. — San Juan region (station 2340); Rico formation. 



PHANEROTREMi Fischer, 1885. 



Phanerotkema cf. GRAYViLLENSE Norwood and Pratten. 



1855. Pleurolomaria grayvUlemfiH. Norwood and Pratten, Acad. Nat. Sci. Philadelphia, Jour., (2), vol. 

 3, p. 75, pi. 9, figs. 7a, b. 

 Coal Measures; Grayville, 111.; near mouth of Rush Creek, Posey County, lud.; Shawnee- 

 town and Galatia, 111. 

 1866. Pleurolomaria grayvUleiisis. Geinitz, Carb. und Dyas in Nebraska, p. 9, tab. 1, fig. 9. 



Upper Coal Mea-sures: Nebraska City, Nebr. 

 1872. Pleuroturnariii (jraynlletisis. Meek, U. S. Geol. Surv. Nebraska, p. 233, pi. 11, fig. 9. 



Upper Coal Measures: Nebraska City, Nebr.; Illinois, Kentucky, Iowa, Missouri, Kansas. 

 Lower Coal Measures: Illinois and West Virginia. 



1879. Pleurolomana grayiillenniii. White, U. S. Geol. Geog. Surv. Terr., Bull., vol. 5, p. 219. 

 Carboniferous: Wild Band Pockets, northern Arizona, 15 miles south from Pipe Spring. 



1880. Pleurolomaria grayvilleusis. White, U. S. Geol. Geog. Surv. Terr., Twelfth Ann. Kept., for 1878, 



. pt. 1, p. 140, pi. 34, fit:. 5a. 



Upper Carboniferous : Wild Band Pockets, northern Arizona, 15 miles south from Pipe Spring. 

 1888. Pletirotomiiria yrayrillermx. Keyes, Acad. Nat. Sci. Philadelphia, Proc, p. 238. 



Lower Coal Pleasures: Des Moines, Iowa. 

 1895. Pleurolomari/i yraynllensis. Keyes, Missouri Geol. Surv., vol. 5, p. 141 (date of imprint 1894). 



Lower Coal Measures: Kansas City and Pleasant Hill, Mo. 

 1897. Pliaiierolrfiiia yrayriUense. Ulrich, Geol. Nat. Hist. Surv. Minnesota, Final Kept., vol. 3, pt. 2, 

 p. 952. 



This species is represented by two small shells resembling Phanerotrema gray- 

 viUense, )>ut they are too poorly preserved to be determined with certainty. Thej^ 

 form the Ijasis for the appearance of Pleurotoniaria grayvillensis in the faunal list of 

 the Leadville monograph." 



Locality and horizon. — Leadville district (station 2275); upper portion of the 

 Weber formation. 



a U. S. Geol. Surv., Mon., vol. 12, 1886, p. 70. 



