802 OAEBONIFEBOUS FORMATIONS AND KAUNAS OF OOLORADO. 



t)ut otlu'fs arc more elongate than even tlie type spcciiiicn ol' Cr. ttuhelliptica, 

 which, as lias Ixhmi said, is somewhat unusual in that regard. For the present, 

 therefore, I refer the Colorado species as a vai'iety of Cniniviut KirJicUipt'ica, though 

 l)etter jireserved and more perfect specimens may show that it should be removed 

 to another species or even another genus. However, its generic affinities can be 

 limited to three closelj- allied subgeneric groups, a circumstance which, with its 

 specific affinities, does not deprive it of stratigraphic significance. In fact, in 

 connection with the associated species, I attach some importance to its presence, as 

 it indicates an age certainly not so late as the Coal Measui'es and probably earlier 

 than the Genevieve period Its associated fauna can scarcely be Devonian, 

 and on the whole the evidence of this species points to the earlier half of the 

 Mississippian era. 



Locality and hori.son. — Canyon (stations 2366, 2370); Millsap limestone. Pikes 

 Peak quadrangle (stations 2365, 2368, 2371); Millsap limestone. Castle Rock quad- 

 rangle (stations 2367, 2389); Millsap limestone. 



EUMETRIA Hall, 1863. 

 EuMETEiA woosTEEi White. 



PI. I, figs. 11, 11a. 



1879. Setzia nvosteri. AVhite, U. S. Geol. Geog. Surv. Terr., Bull., vol. .5, p. 215. (Some copies 



dated 1880. ) 

 Carboniferous: 18 inilea north of Greeley, Colo. 



1880. nazia woosteri. White, U. S. Geol. Geog. Surv. Terr., Twelfth Ann. Kept., for 1878, pt. 1, 



p. 134, pi. 34, flgs. 8a, b. 

 Coal Measures: 32 miles west and 18 miles north of Greeley, Colo. 

 1883. Retzia ivoosteri. White, U. S. Geol. Geog. Surv. Terr., Twelfth Ann. Kept., for 1878, pt. 1, 

 p. 134, pi. 34, figs. 8a, 6. 

 Coal Measures: 32 miles west and 18 miles north of Greele)', Colo. 

 1898. Eumetriawoosteri. Waller, U. S. Geol. Surv., Bull. No. 153, p. 2fi3. 



Founded upon an impression taken from a mould in a bowlder in a conglomerate 

 in Larimer County, some 50 miles from Greeley, Colo., it is unfortunate that this 

 species was ever the recipient of a distinctive name. The type and only authentic 

 specimen occurs with a fauna which White referred to the Coal Measure.s, but which 

 I feel satisfied is of Mississippian age, and LJu. woosteri itself is of a distincflj' Mis- 

 sissippian type. Nothing comparable to it is known from the Upper Carboniferous, 

 while it is so similar to Eu. marcyi and Eu. altirostris that it is almost certainly a 

 synonym of one or other of these species. Weller" states that Eii. altirostris is 

 distinguished from Eu. marcyi by having a more acute and more erect beak, coarser 

 plications, and the slight sinus with its stronger median furrow. These characters, 



a Acad. Sei. St. Louis, Trans., vol. 10, 1900, p. 75. 



