82 Cincinnati Society of Natural History. 



prominent spiniform tubuli, larger in the groups or monticules than 

 over the general surface. (Jour. Cin. Soc. Nat. Hist., vol. 6, 1883, 

 p. 157, as Petigopora as Peru la.) 



Locality. — Cincinnati, Ohio, and Covington, Ky. 



66. — M. crustulata James, 1878. 



Corallum forming a thin crust, parasitic on shells of Orthoceras 

 and other substances, and from one-eighth of a line to one-fourth of a 

 line thick ; surface generally smooth, sometimes with a few small eleva- 

 tions; calices sub-polygonal, rounded or oblong, varying in form and 

 size ; at intervals of about two lines are groups of larger cells, some- 

 times the center one larger than the rest ; walls of corallites very thin, 

 sometimes bearing numbers of spiniform corallites; no interstitial cells. 

 (The Paleontologist, July, 1878, and January, 1879, PP- x > 2 °> as 

 C/iretetes.) (Leptot?ypa ornata Ulrich, Jour. Cin. Soc. Nat. Hist., vol. 

 6, 1883, p. 160: L. clavis, Ulr., Ibid., p. 161; L. cortex Ulr., Ibid., 

 p. 162; Spatiopora lineata Ulr., Ibid., p. 167.) 



Locality. — Cincinnati and Hamilton, Ohio. 



Re??iarks. — With this species as with M. ortoni thesynonomy may 

 seem excessive. But a careful comparison of the descriptions of Mr. 

 Ulrich has not made it possible to draw any distinguishing lines 

 between them. Perhaps Spatiopora lineata might be separated, as in 

 this the cells seem to be all of one size without clusters of larger ones, 

 and they are arranged in regular lines. Otherwise there is no differ- 

 ence to be observed. The tabulae are not numerous and are horizontal. 



67. — M. aspera Ulrich (sp.), 1883. 



Corallum parasitic, forming large and thin expansions, attached 

 to species of Ort/ioceras, and about .5 line thick; surface smooth, 

 with clusters of cells larger than the average ; calices oblong, varying 

 in size from tto of an inch to 53 of an inch in diameter; walls thin, 

 with spiniform corallites more or less numerous at the angles of the 

 cells; cell walls frequently indented; tabulae wanting. (Jour. Cin. 

 Soc. Nat. Hist., vol. 6, 1883, p. 166, as Spatiopora aspera.) 

 {Spatiopora maculosa Ulr., Ibid. p. 167.) 



Locality. — Cincinnati, Hamilton and other points in Ohio. 



Remarks. — The two species united above are so similar as not, in 

 the opinion of the writer, to justify a separation. The only distinc- 



