340 CARBONIFEROUS E'ORMATIONS AND FAUNAS OF COLORADO. 



faco gi'anulose instoad of .striated. These observations are based cntin^lv upon 

 the Lcadville specimen. 



Locality and Iwrizon. — San Juan region (station 2ii21); upper portion of the 

 Herniosa foruiatiou. Leadville district (station 2265). 



PRISMOPORA Hall, 1881. 



Prismopoka tkiangulata White. 



PI. I, fig.|5. 



1878. Plilodicliii frkDir/uhita. White, Acad. Nat. Sci. Philadelphia, Proc, p. 35. 

 Coal Measures: Danville, 111. 



1879. Ptilodiclia Iriangulata. White, II. S. Geol. Geog. Surv. Terr., Bull., vol. 5, p. 214. 

 Carboniferous: Yampa Plateau, northwestern Colorado. 



1880. PlUodictia iriangulata. White, U. S. Geol. Geog. Surv. Terr., Twelfth Ann. Kept., for 1878, 



pt. 1, p. 131, pi. 33, figs. 3a-c. 

 Coal Measures: Danville, 111.; Yampa Plateau, northwestern Colorado; and region southward 

 from Yellowstone National Park. 



1881. PtUodiclia tnangidata. White, U. S. Geog. Geol. Surv. W. 100th Mer., Kept., vol. 3, Supp., 



Appendix, p. xxiv, pi. 4, flgs. 2a-c. 

 Carboniferous: CeboUa Creek and Coyote Creek, New Mexico. 



White described this .species from Danville, 111., in 1878, and the year following- 

 published an identification, with comments and figures, from the Yampa Plateau, in 

 northwestern Colorado. Although specimens belonging to the genus Prismo])ora 

 appear in our collections from several stations, those identified by White are the 

 only ones which I have placed with Pr. iriangulata, and his figures, drawn from 

 a Coloi'ado specimen, have been used to illustrate the species. 



The illustration on PI. I represents the specimen as somewhat enlarged. The 

 real size of the branches between the nodes varies from 2 to 1.5 mm. 



Locality and horizon. — Uinta Mountain region, Yampa Plateau (station 2330); 

 middle division of the Carboniferous. . 



Prismopoea serrata Meek. 



1875. Ptilodictija {Sticlopora) serrata. Meek, Pal. Ohio, vol. 2, p. 327, pi. 20, flg. 4. 



Lower Coal Measures: Flint Ridge, Ohio. 

 1887. Prismopora serrata. Foerste, Sci. Lab. Denison Univ., Bull., vol. 2, p. 75, pi. 7, figs. 6a-c. 



Coal Measures: Bald Hill and Flint Eidge, Ohio. 



This species occurs in some abundance near Rock Creek (station 2245) and in 

 the San Juan region (.station 2331), and a single fragmentarj" specimen has also been 

 collected at Rico (station 2301). The edges are often flexuous, but sometimes 

 nearly straight. The branches are of larger size than the specimen by which 

 Pr. iriangulata is represented. The zocBcia are small and evenlj^ distributed. 



Locality and horizon. — San Juan region (stations 2301, 2331); middle part of the 

 Hermosa formation. Crested Butte district (station 2245). 



