DESCRIPTIONS OF SPECIES. 341 



Prismopora sp. 



This form probably belongs to a yet undescribed species, but it is represented, 

 unfortunately, by only extremeh' imperfect material. Tlie branches are larger than 

 in Pt. triangvlata, the zooecia larger and more closelj^ arranged. It resembles Pr. 

 serrata in the size of its branches, but has the zooecia a little larger and considerably 

 more closely arranged. 



Locality and horizon. — San Juan region (station 3336); middle portion of the 

 Hermosa formation. 



RHOMBOPORA Meek, 1872. 

 Rhombopora lepidodendroides Meek. 



1866. Stenopora columnaris (pars). Geinitz, Carb. und Dyas in Nebraska, p. 66. (Not Schlotheim, 

 1813.) 

 Upper Coal Measures: Nebraska City, Bennetts, and AVyoming, Nebr. 

 1872. _lihomhopora lepidodendroideK. Meek, U. S. Geol. Sun'. Nebraska, p. 141, pi. 7, figs. 2a-f. 



Upper Coal Measures: Nebraska City, Bennetts, Wyoming, Kock Bluff, and Plattsmouth, 

 Nebr.; Kansas; Iowa; Missouri; Illinois. 

 187.5. Rhombopora lepidodendroides. White, U. S. Geog. Geol. Surv. W. 100th Mer., Rept., vol. 4, p. 

 99, pi. 6, figs. 5a-d. (Whole volume published in 1877.) 

 Carboniferous: West face of Oquirrh Range, near "E. T. City," Utah, and at confluence of 

 White Mountain and Black rivers, Arizona. 

 1884. Rhombopora lepidodendroidea. Ulrich, Jour. Cincinnati Soc. Nat. Hist., vol. 7, p. 27, pi. 1, 

 figs. 1-lb. 

 Upper Coal Mea.sures: Kansas City, Mo.; Nebraska City and Wyoming, Nebr. 

 1887. Rhombopora lepidodendroidea. Foerste, Sci. Lab. Denison Univ., Bull., vol. 2, p. 73, pi. 7, 

 figs. 3a, b. 

 Coal Measures: Flint Eidge and Bald Hill, Ohio. 



1887. Rhombopora . Foerste, Sci. Lab. Denison Univ., Bull., vol. 2, p. 74, pi. 7, figs. 5a-c. 



Coal Measures: Flint Eidge, Ohio. 



1888. Rhombopora lepidodendroides. Keyes, Acad. Nat. Sci. Philadelphia, Proc, p. 225. 

 Lower Coal Measures; Des Moines, Iowa. 



1895. Rhombopora lepidodendroidea. Keyes, Missouri Geol. Surv., vol. b, p. 3.5, i>l. 33, figs. 4a, b. 



(Date of imprint, 1894.) 

 Upper Coal Measures; Kansas City, Mo. 



1896. Rhombopora lepidodendroides. Smith, Am. Phil. Soc, Proc, vol. 35, p. 237. 

 Upper Coal Measures; Poteau Mountain, Indian Territory. 



1896. Rhombopora lepidodendroides. Smith, Leland Stanford Junior Univ., Pub.; Cont. Biol. Hopkms 

 Seaside Lab., No. 9, p. 27. 

 Upper Coal Measures: Poteau Mountain, Indian Territory. 



This name, as I have used it here and as it has often been employed in literature, 

 probably stands rather for a group of forms than for a single consistent species. 

 To reduce to proper scientific status the collections from Colorado, and much more 



