Fauna of the Morrow Group 
95 
the central portion of the preceding tabula; mural pores only 
rarely present, irregularly placed. 
Remarks, The genus Pachypora has not heretofore been re- 
ported from the Carboniferous strata of North America although 
it is known in the Productus limestone of the Salt Range and 
possibly elsewhere in Europe and Asia. The thickening of the 
walls of the calyces, the close spacing of the tabulae, and the 
irregular distribution of the mural pores, as displayed by the 
specimens at hand, point unmistakably to the reference of the 
species to this genus. The corallum is ordinarily much larger 
and the corallites have a much greater diameter in P. carbonaria 
than in either of the Salt Range forms. 
Horizon and locality, Brentwood limestone : near Brentwood, 
Arkansas (Station 145). Morrow formation: near Ft. Gibson 
(Stations 296 and 301), and Choteau (Station 297), Oklahoma. 
Genus MICHELINIA De Koninck 
Michelinia eugeneae White 
Plate I, figures 17, 17a; Plate II, figure 1. 
1884. Michelinia eugeneae. White, 13th Rep. Geol. Surv. Ind., p. 119, pi. 
23, figs. 14-16. 
Coal Measures: Edwardsport, Knox County, and Eugene, Ver- 
milion County, Indiana. 
1894. Michelinia hranneri. Miller and Gurley, Bull. No. 3, 111. State Mus. 
Nat. Hist., p, 68, pi. 7, figs. 12-13. 
Coal Measures: Danville, Illinois. 
1900. Michelinia eugeneae. Beede, Univ. Geo. Surv. Kas., vol. 6, p. 21, 
pi. 2, figs. 12-12b. 
Upper Coal Measures: Pomeroy, Wyandotte County, Kansas. 
Description, Corallum variable in size and shape, but gen- 
erally globular or irregularly ovoid in form with height either 
greater or less than major transverse diameter, the greatest 
diameter in few specimens less than 20 mm. and not known to 
exceed 85 mm. ; corallites opening upon all sides except the base 
which is covered with a wrinkled, concentrically striated epi- 
theca extending for a variable but small distance from the 
point of attachment; the corallites polygonal, commonly hexa- 
gonal or pentagonal in cross-section, and with quite diverse 
diameters, the majority of which fall between 2 and 3 mm. ; 
calyces exceeding in depth the diameter of the corallites and 
bounded by thin walls; septa represented by numerous longi- 
