454 ('AK15()NIFEROUS FORMATIONS AND FAUNAS OK COLORADO. 



Of tills species our colleotlons from Colorado still contiiiii onl^' the specimen for 

 which the nnme lVciir<>f<iin(iri<( idijijurfi was originally proposed. It scarcely .seems 

 necessary at this place to repeat Meek's excellent description, but the figures 

 pulilished 1)y White are shown on PI. X. 



LiHuilify (Old horizon. — Leadville district (station 2iJ81); base of the Weber 

 foi'niation. 



EucoNispiRA BiCARiNATA McChesney. 



ISliO. I'li'iirotoniarid bicarinaUi. McChesney, Desc. New Spec. Pal. Foss., p. 90. (Not P. himriyisa 

 Sowerby, 1818.) 



Coal Measures: Lasalle, 111. 

 18(>0. Pleiirotoiiiarla turbiniformis. Meek and Worthen, Acrad. Nat. Sci. Philad^ljihia, Proc., p. 461. 



Upper Coal JMeaaures: Lasalle, 111. 

 I86I1. Plenrotomaria turbiniformis. Meek and Worthen, Geol. Surv. Illinois, Rept., vol. 2, p. 3.59, 

 pi. 28, figs. 8a-c. 



Upper Coal Measures: Lasalle, 111. 

 1884. Pleurotomaria turbiniformis. White, Geol. Surv. Indiana, 13th Rept., jj. 160, pi. 32, figs. 7, 8. 



Upper Coal Measures: Lasalle and Paris, III.; Vigo County, Ind. 

 1894. Pleurotomaria tarbiniformis. Keyes, Missouri Geol. Surv., vol. 5, p. 13.5, pi. 48, figs. 6a, b. 



Upper Coal Measures: Kansas City, Mo. 

 1897. Euconispira turbiniformia. Ulrich, Geol. Nat. Hist. Surv. Minnesota, Final Rept., vol. 3, pt. 2, 

 pp. 949,956, figs, d, e, on p. 1080. 



Upper. Carboniferous: Kansas City, Mo. 



Of this species we have a single specimen from the Hermosa formation which is 

 not very perfect but shows sufficient characters to make possible a specific determina- 

 tion of considerable accuracy. After a comparison with aiithentic specimens of 

 Pleurotomaria furhiniformis from the original localitj', the conclusion has been 

 reached that the two forms are with but little doubt identical. 



Meek noted that his name PI. turbiniformis had been proposed for the same species 

 as PI. hicarinata McChesney, which antedates it by several months, but his reason 

 for retaining PL turbiniformis, that the name PI. hicarinata is tlirice preoccupied, 

 is invalidated by the removal of that species to another genus. 



Locality and horizon. — San Juan region (station 3196b); Hermosa formation. 



Euconispira sp. a. 



This form in size and configuration veiy closely resembles Eu. hicarinata., but 

 several differences can be pointed out which indicate that it should be considered a 

 distinct species. The single specimen representing it was obtained from the red 

 sandy beds of the Rico formation. The surface ornamentation is almost entirely 

 obscured, but there are in places certain markings, which may be accidental, that 

 might be interpreted as indicating that the surface was traversed by a small num- 



