DBSCEIPTIONS OF SPECIES. 323 



CAMPOPHYLLUM Milne-Edwards and Haime, 1850. 

 Campoph^lltjm torquitjm Owen. 



1852. Cyatliopliyllum {vermicularef) . Owen, Geol. Surv. Wisconsin, Iowa, and ilinnesota, pi. 4, fig. 2, 



Carboniferous limestone: Xear mouth of Keg Creek. 

 1852. Cyathophyllvm torquium. Owen, Geol. Surv. Wisconsin, Iowa, and Minnesota, pi. 4, fig. 2. 



Carboniferous limestone: Jsear mouth of Keg Creek. 

 1852. Cyathophyllum flexiiomm (f) . Owen, Geol. Surv. Wisconsin, Iowa, and Minnesota, |il. 4, figs. 

 3a, h. 



Carboniferous limestone: Near mouth of Keg Creek. 

 1872. Canipophyllum torquium. Meek, U. S. Geol. Surv. Nebraska, p. 145, pi. 1, figs. la~d. 



Upper Coal Measures: Rock Bluff and Cedar Bluff, Nebraska; Iowa. 



Coal Measures: Illinois. 

 1884. Campophyllum torquium. White, Geol. Surv. Indiana, 1.3th Rept., p. 119, jil. 23, figs. 10-13. 



Upper Coal Measures: Iowa; Missouri; Nebraska; Illinois; Indiana. 

 1894. Campophyllum torquium. Keyes, Missouri Geol. Surv., vol. 4, p. 107, pi. 12, figs, la-c; pi. 13, fig.7. 



Coal Measures: Kansas City, Mo. 

 1900. Campophyllum torquium. Beede, Univ. Geol. Surv. Kansas, Rept., vol. 6, p. 19, pi. 4, fig. 1; pL 

 5, figs. 1-1- 



Coal Measures: Kansas City, Jefferson, Douglas, and Chautauqua counties, Kans. 



The fossils representing this species are in no instance abundant, and they are 

 usual!}' in a poor condition of preservation. They can probably safely be referred, 

 however, to the common C. torquiuia. 



Locality and horizon. — San Juan region (stations 2206, 220S); upper portion of 

 Hermosa formation. Ouray (station 219^); Hermosa formation. Crested Butte 

 district (stations 2291, 2298, 2312); Weber lime.stone and Maroon conglomerate. 



ZAPHRENTIS Rafinesque, 1820. 



Zaphrentls gibsoni White. 



1884. Zaphrenlli (jihsoiii. White, Geol. Surv. Indiana, 13th Rept., p. 117, pi. 23, figs. 4, 5. 

 Coal Measures: Vermilion County, Ind. 



White calls attention to the fact that the genus Zaphrentu., which occurs so 

 abundantly in the earlier Carboniferous and throughout the Devonian, is verj'' rare 

 in strata of Upper Carboniferous age. Only three specimens in our collections 

 from Colorado can be referred to Zaphrentis, and each was found at a separate 

 locality. They are in mutual agreement in having 36 somewhat alternating septa, 

 but present minor diflerences in regard to rate of enlargement, prominence of the 

 fossula, amount of interseptal tissue, etc. As the.se points are susceptible of consid- 

 erable variation within the limits of a single species, they do not in this instance, 

 it .seems to me, call for a subdivision of the small group of forms presented for 



