Manual of the Paleontology of the Cincinnati Group. 



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82. — M. (constellaria) parva Ulrich, 1890. 



Corallum irregularly undulating or frondose, 2 to 3 mm, thick, 

 25 mm. or more high, from a broad base : surface smooth, with star- 

 shaped maculae from 1 to 1.5 mm, apart, about 60 in 10 mm. square : 

 walls of corallites thin throughout, ringlike in the mature region, 

 bending rather abruptly from the axial to the peripheral region ; about 

 0.08 mm. in diameter between the stars, the 2 to 6 cells between the 

 rays of the maculae about 0.13 mm. in diameter : calices circular with 

 a peristome : interstitial cells angular, thin walled, arranged in star- 

 shaped maculae, and in the intermediate spaces surrounding the coral- 

 lites in 1 or 2 series : tabulae from one-half to one tube-diameter apart 

 in the peripheral region, and from 1 to 2 diameters apart in the axial 

 region: very crowded in the interstitial cells. (Geol. Sur. Ills., vol. 

 8, 1890, p. 425.) 



Locality. — Wilmington, Ills. 



Sub genus C. 

 fistulipora McCoy, 1849. 



Corallum ramose or incrusting : corallites of two kinds, larger 

 ones oval or circular, with few and remote tabulae, with well devel- 

 oped walls, not thickened toward the surface; often with oblique 

 calices, surrounded by small, interstitial cells in one or two rows, the 

 apertures generally angular ; tabulae in these corallites numerous, 

 sometimes vesicular, by imperfection of the walls of the neighboring 

 corallites ; maculae, if present, generally made up of smaller cells 

 than the average, never elevated above the surface, or surrounded by 

 radiating ridges as in Conslellaria ; interstitial cells often closed by a 

 thin, calcareous membrane: walls of calices generally thin. (Ann. & 

 Mag. Nat. Hist., 2d ser. vol. 3, 1849, p. 130. Nicholson, Pal. Tab. 

 Corals, 1879, pp. 292, 304.) {Callopora Hall, Pal. of N. Y., vol. 2, 

 1852, p. 144.) 



83. — M. (fistulipora) oweni James, 1884. 



Corallum in flat, twisted expansions, one half to one line thick ; 

 sometimes lobate, or in sub-cylindrical, hollow tubes: surface with 

 clusters of eight or ten projecting apertures in each line, sometimes 

 regularly and again irregularly arranged maculae about one line apart 

 and about one-half a line across; sometimes depressed, the interstitial 



