DESCRIPTIONS OF SPECIES. 457 



1884. Pleurotomaria tabulaia. White, Geol. Surv. Indiana, 13th Eept., p. 160, pi. 32, figs. 4, 5. 



Upper Coal Measures: Eush Creek, Posey County; AV agon-defeat Creek, Sullivan County, and 

 Warrick County, Ind. 

 1895. Pleurotomaria tabulaia. Keyes, Missouri Geol. Surv., vol. 5, p. 142. (Date of imprint, 1894.) 



Upper Coal Measures: Kansas City, Mo. 

 1897. Worthenia iabulata. Ulrich, Geol. Nat. Hist. Surv. Minnesota, Final Kept., vol. 3, pt. 2, pp. 

 949, 950, 953. 



Tlii.s tj'pe is represented b}' a single specimen from Sinbads Valle3^ It is 

 reduced nearl}' to the condition of an internal cast, but probably can be referred to 

 Conrad's species. 



Locality and horizon. — Dolores River region, Sinbads Valle}' (station 2285); top 

 of the Hermpsa formation. 



Worthenia? lasallensis Worthen? 



1890. Murchisonia lasallensis. Worthen, Geol. Surv. Illinois, Kept., vol. 8, p. 141, pi. 25, figs. 7, 7a. 

 Upper Coal Measures: Lasalle, 111. 



In using for this form the name of Worthen's species, I desire to indicate a 

 resemblance rather than to express an identification, foi' the single specimen which 

 has so far come to hand is too poor to permit a determination of that degree of 

 accuracy. The surface ornamentation is entirely obscured, but the shape and size 

 ai'e those of Murchisonia lasallensis. It might almost as well be referred to 

 Murchisonia terebra White, but it is a smaller form with deeper indented sutures. 



This species has been placed with the genus Worthenia because of its configuration 

 alone. It is certainlj^ not a Mi/rchisoiiia, and while it departs somewhat widely from 

 the type represented by the species tahulata and mibscalaris., the range is no greater 

 than that shown ]jy the related genus Lophospira. As already intinlated, I have not 

 been able to examine representatives of this species in which the essential generic 

 characters are shown. 



Locality and horizon. — San Juan region (station 2217); middle portion of the 

 Hermosa formation. 



Worthenia? MARCotriANA Geinitz ? 



1866. Murchisonia marcouiaua. Geinitz, Carb. und Dyas in Nebraska, p. 11, tab. 1, fig. 16. 



I'pper Coal Measures: Rock Bluff, Nebr. 

 1899. Murcldsonia raarcouiana. Girty, U. S. Geol. Surv., Nineteenth Ann. Kept., pt. 3, p. 588. 



Upper Coal Measures: McAlester quadrangle, Indian Territory. 



The form wliich I have referred to Worthenia iiiarcouiana seems to be abundant 

 in the Rico formation at stations 2340 and 2345. The condition of pi-eservation of 

 my material does not favor an identification of the greatest accuracy. 



At station 2275, in the upper part of the Weber grits in the Tenmile district, 

 occurs a specimen which probablj' answers to Micrchisonia sp. in the list of the 

 Leadville monograph." It seems to belong to this species. 



aU. S. Geol. Surv., Mon., vol. 32, p. 70. 



