DESCRIPTIONS OF SPECIES. 337 



CHAINODICTYON Foerste, 1887. 

 Chainodictton laxum Foerste. 



1887. Chainodidyon laxum. Foerste, Sci. Lab. Denison Univ., Bull., vol. 2, pp. 81 and 87, pi. 7, figs. 



8a-c. 

 Coal Measures: Flint Eidge, Ohio; Seville, 111. 



1888. Chainodictyon laxum. Foerste, Sci. Lab. Denison Univ., Bull., vol. 3, p. 135. 



A poorly preserved fragment is all that we have of this strongly characterized 

 species, but its affinities are probably as stated above. 



Locality and horizon. — San Juan region (station 2332); middle portion of the 

 Hermosa formation. 



SEPTOPORA Prout, 1859. 



Septopora deltcatula Ulrich. 



1890. Septopora delicaiula. Ulrich, Geol. Surv. Illinois, Kept., vol. 8, p. 634, pi. 64, figs. 5, 5a. 

 Lower Coal Measures: Seville, 111. 



This species is represented by very fragmentary and scanty material, but tiie 

 identification is probably correct. 



Locality. — LeadvUJe district (station 2265). 



Septopora sp. 



A single very imperfect specimen of this species has come to hand. It is spe- 

 cifically distinct from the form noticed above, and is possibly related to <S'. cestriensis 

 Prout. 



Locality and horizon. — San Juan region (station 2207); upper portion of the 

 Hermosa formation. 



POLYPORA McCoy, 1845. 



PoLYPORA wHiTEi var. iNSCDLPTA Ulrich. 



1889. Polypora ivhitei v&T. eximia (in error for insculpta). Miller's North American Geol. and Pal., 



p. 317. 



1890. Polypora lohitei var. insculpta. Ulrich, Geol. Surv. Illinois, Kept., vol. 8, p. 600, pi. 62, fig. 1. 

 Upper Coal Measures: Springfield, 111. 



At station 2331 on the Animas River in the San Juan region, a prolific locality 

 for Bryozoa, was obtained a small fragment of a Polypora whose characters, so far 

 as they are shown, allj^ it closel}" to P. whitei var. inscul])ta. A form which is 

 possibly identical with that from the San Juan occurs in the Leadville region at 

 station 2265. 



Locality and horizon. — San Juan region (station 2331); Hermosa formation. 

 Leadville district (station 2265). 



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