Manual of the Paleontology of the Cincinnati Group. 



77 



as the corallites proper ; walls but little thickened in the cortical 

 region ; tabulae few near cortical region in ordinary corallites but 

 numerous in the interstitial ones; spiniform corallites small and 

 inconspicuous. (Geol. Sur. of Ills., vol. 8, 1890, p. 426, as Leioclema 

 wilmingtonense. ) 



Locality. — Wilmington, Ills. 



59. — M. singularis Ulrich (sp.), 1890. 



Corallum "sub-ramose," sometimes seven cm. thick; surface 

 smooth or nearly so, with clusters of cells slightly larger than the 

 average; corallites nine in two mm., angular and thin-walled in the 

 axial, sub-circular in the mature region ; interstitial cells numerous, 

 variable in size, angular or sub-circular ; tabulae irregular in numbers, 

 sometimes few in the cortical and wanting in the axial region, at 

 others present in the axial and closely set in the peripheral region ; 

 generally "horizontal, often concave, sometimes infundibular and 

 occasionally simulate cystisphragms [vesicles] if they are not of that 

 nature;" spiniform corallites very numerous, inflecting the visceral 

 cavity and giving it a petaloid appearance. (Geol. Sur. of Illinois, 

 vol. 8, 1890, p. 415, as Heterotrypa singularis ; also Pal. of Minn., 

 vol. 3 of Geol. and Nat. Hist. Survey, 1893, p, 268.) 



Locality. — Wilmington, Ills., and Wisconsin. 



60. — M. inflect a Ulrich (sp.), 1890. 



Corallum frondescent, about four cm. wide, six cm. long and 

 three to five mm. thick ; surface smooth or with slight elevations with 

 cell apertures larger than the average : corallites bending abruptly into 

 the cortical region ; walls slightly flexuous in the axial portion ; calices 

 circular, about eight in two mm.; numerous interstitial corallites, 

 which are more abundant in the clusters; tabulae only one or two in 

 each tube, but numerous in the interstitial cells ; spiniform corallites 

 present, frequently indenting the visceral cavity, and giving the surface 

 a hirsute appearance. (Geol. Sur. Illinois, vol. 8, 1890, p. 414, as 

 Heterotrypa inflect a.) 



Locality. — Cincinnati, O. 



