Fauna of the Morrow Group 
111 
Fayetteville and Brentwood, Arkansas (Stations 134 and 145). 
Morrow formation: near Ft. Gibson, Oklahoma (Stations 296 
and 301). 
BA TOSTOMELLID^ 
Genus STENOPORA Lonsdale 
Stenopora tuberculata (Prout) 
Plate IV, figures 3-5. 
1859. Flustra tuberculata. Prout, Trans. St. Louis Acad. Sci., vol. 1, p. 
447, pL 17, figs. 3»3f. 
Second Archimedes limestone: Barrett’s Station, St. Louis County, 
Missouri. 
1860. Cyclopora polymorpha. Prout, Trans. St. Louis Acad. Sci., vol. 1, 
p. 578. 
Chester limestone: Pope County, Illinois. 
1866. Cyclopora polymorpha. Prout, Geol. Surv. 111., vol. 2, p. 421, pi. 21. 
figs. 5-5b. 
Chester group: Pope County, Illinois. 
1890. Stenopora tuberculata. Ulrich, Geol. Surv. 111., vol. 8, p. 441, fig. 
17 ; also fig. 5c, p. 315. 
Chester group: Chester, Illinois. 
St. Louis limestone and Warsaw beds. 
1894. Stenopora tuberculata. Keyes, Mo. Geol. Surv., vol. 5, p. 15. 
St. Louis limestone: Barrett Station, Missouri. 
Kaskaskia limestone: Chester, Illinois. 
1903. Stenopora tuberculata. Condra, Nebr. Geol. Surv., vol. 2, pt. 1, p. 
42, pi. 4, fig. 6. 
Coal Measures: Southbend, Nebraska. 
Warsaw group: Bennett’s Station, Missouri. 
St. Louis group: several localities. 
Chester group : Pope County and Chester, Illinois ; Grayson Springs 
and Sloan’s Valley, Kentucky. 
1903. Stenopora tuberculata. Girty, Prof. Paper, U. S. Geol. Surv., No. 
16, p. 335. 
Weber limestone: Crested Butte district, Colorado. 
This well known and probably somewhat comprehensive spe- 
cies is represented in the Morrow collections by a number of 
specimens. In some the zoarium is an extremely thin, ex- 
panded crust attached to other organisms while in others it con- 
sists of laminar growths with a rugose epitheca on the under 
side varying in thickness from 0.5 to 1.5 mm. The surface is 
in all cases apparently smooth except for the tiny spine-like 
protuberances of the acanthopores when the preservation is 
excellent. The cell apertures are quite variable in size and shape 
