DESCEIPTIOWS OF SPECIES. 335 



This species is represented b}^ a zoarium which had au irregular shape and a 

 submassive growth. The thickness is about 12 mm. and the greatest diameter 

 26 mm. Ulrich's description and figures, which I will not quote here, so closely 

 represent the characters of my specimen as I have made them out, that the iden- 

 tification is offered with some confidence. 



Locality and horizon. — San Juan region (stations 2207,2213); upper and lower 

 portions of the Hermosa formation. 



STENOPORA Lonsdale, 1844. 

 Stenopoka cakbonaria Worthen. 



1875. Chseleteaf carhonaria. Worthen, Geol. Surv. Illinois, Kept., vol. 6, p. 526, pi. 32, fig. 5. 

 Coal Measures: St. Clair County, 111. 



1887. Stenopora carhonaria. Foerste, Sci. Lab. Denison Univ., Bull., vol. 2, p. 85, pi. 7, figs. 13a-o. 

 Coal Measures: Bald Hill and Flint Ridge, Ohio. 



1888. Stenopora carhonaria. Foerste, Sci. Lab. Denison Univ., Bull., vol. 3, pi. 8, figs. 13a-c. 

 1890. Stenopora carhonaria. Ulrich, Geol. Surv. Illinois, Rept.,vol. 8, p. 445, pi. 73, figs. 8, 8a. 



Coal Measures: Casey ville. 111.; Lawrence, Kans. ; Ohio. 



Two specimens of this form have come to hand. They seem to belong to the 

 well known Stenopora carhonaria. 



LocaUtij and horizon. — San Juan region (station 2213); lower portion of the 

 Hermosa formation. 



Stenopora cestriensis Ulrich. 



1890. Stenopora censlrienm. Ulrich, Geol. Surv. Illinois, Kept., vol. 8, p. 442, pi. 74, -figs. 7, 7a. 



Chester groujj: Chester, 111. 

 1895. Stenopora ceslrienais. Keyes, Missouri Geol. Surv., vol. 5, p. 16. (Date of imprint 1894.) 



Kaskaskia limestone: Chester, 111. 



This species is represented by two specimens in a fairly good state of preser- 

 vation. They agree with Ulrich's description of St. cestriensis and differ from the 

 related form, St. tvherculatm, in the characters pointed out by him, viz, "the cells 

 are .smaller, their individual walls more clearly defined, the acanthopores more 

 conspicuous, and the zooecial layers at least twice as thick." 



Locality. — Leadville district (station 226.5). 



Stenopora tuberculata Prout. 



1859. Flwira tuherculata. Prout, Acad. Sci. St. Louis, Trans., vol. 1, p. 447, pi. 17, figs. 3-3f. 

 Second Archimedes limestone: Barrett Station, St. Louis County, Mo. 



1860. Cyclopora polijinorpha. Prout, Acad. Sci. St. Louis, Trans., vol. 1, p. 578. 

 Chester limestone: Pope County, 111. 



1866. Cyclopora poly tnorpha. Prout, Geol. Surv. Illinois, Eept.,vol. 2, p. 421, pi. 21,. figs. 5-5b. 

 Chester group: Pope County, 111. 



