354 CARBON I FKKOTi^i FORMATIONS AND KAUNAS oK COLORADO. 



Tho Colorado collection consists for the most part of largo shells, with strong 

 stria> and slight dcvH^.lopmcnt of sinus. The shape is gen(>rally sul){|iiadrat(\ The 

 width is greater, though not verj' nuich so, than tiie length, and the hinge line is but 

 slightly extended. Exception must he made, however, of a few poorl}- preserved 

 specimens from station ^213 in the San Juan region, which are smaller and more 

 gibbous than the others and have a strongly impressed ventral sinus. These latter 

 have been referred to Ch. fiemingi var. verneuiliunun. Ch. fieui'uigi is rather 

 abundant at Glenwood Springs, the form being small and with indistinct sinus. 



Locality and horizon. — Crested Butte district (stations 2293, 2313, 2315); Weber 

 limestone and Maroon formation. Grand River region (station 2324), Glenwood 

 Springs (stations 2193a, 2326, 2329b). Oura}' (station 2194); Hermosa formation. 



Chonetes flemingi var. veeneuilianus. 



1854. Choneles vemeuilana. Norwood and Pratten, Acad. Nat. Sci. Philadelphia, Jour., (2), vol. 3, 

 p. 26, pi. 2, figs. 6a-c. (Imprint of whole volume 1855). 



Coal Measures: Charboniere, Mo. 

 1859. Choneles verneuiliana. Meek and Hayden, Acad. Nat. Sci. Philadelphia, Proc, p. 26. 



Upper Coal Measures: Manhattan, Kans. 

 1861. Chonetes verneuiliana. Newberry, Ives's Colorado River Expl. Exped., p. 128. 



Upper Carboniferous: Cherty limestones on banks of the Colorado River, 100 miles northwest 

 of San Francisco Mountain. 

 1872. Chonetes verneuilana. Meek, U. S. Geol. Surv. Nebraska, p. 170, pi. 1, figs. 10a, b. 



Upper Coal Measures: Plattsmouth, Nebr. ; Kansas; Iowa; Missouri; Illinois. 

 188.3. Choneles rerneuili. Hall, Rept. New York State Geol. for 1882, pi. (16) 47, flgs. 20-21. 



Coal Measures: Western States. 

 1884. Choneles verneuiliana. White, Geol. Surv. Indiana, 13th Rept., p. 128, pi. 25, figs. 7, 8. 



Coal Measures: Every county in the Coal Measures of Indiana. 

 1892. Chonetes verneuiliana. Hall and Clark, Int. Stud}' of Brach., pt. 1, jjl. 20, figs. 5, 6. 



Coal Measures: Illinois. 

 1892. Chonetes verneuiliana. Hall and Clarke, Pal. New York, vol. 8, pt. 1, pi. 6, figs. 20, 21. 



Coal Measures: Illinois. 

 1900. Chonetes verneuUianus. Beede, Geol. Surv. Kansas, Rept., vol. 6, p. 72, pi. 9, figs. 4-4c. 



Lower and Upper Coal Measures: Bronson, Bourbon County, Kansas City, Buffalo Mound, 

 Wabaunsee County, Kans. 



A few poorly preserved specimens from station 2213 in the San Juan region 

 have been provisionallj' placed with Ch. flemingi var. verneuiliam.us. They differ 

 from the form identified as Ch. flemingi in being smallei', more transverse, and 

 furnished with a deeper sinus. 



Locality and horizon. — San Juan region (station 2213); lower portion of Hermosa 

 formation. 



