i82 Cincinnati Society of Natural History. 



thickness ; upper surface smooth and destitute of monticules, 

 but occasional specimens with groups of calices slightly 

 larger than the average; under surface, when unworn, cov- 

 ered with a delicate epitheca showing fine concentric lines 

 and radiating, striae ; cell apertures sub-circular, with thin 

 walls when well preserved, but frequently appearing thick if 

 worn, sometimes arranged in regular, slightly-curved rows, 

 of from four to twelve or more, and seven or eight in one 

 line ; corallites somewhat bent or tortuous, tabulate, the 

 smaller more closely than the larger ones; tabulae mostly 

 horizontal ; in cross sections there are shown two kinds of 

 tubes, the larger mostly circular, the smaller more numerous 

 and varying in shape. {Ann. and Mag. Nat. Hist. 2d ser., vol. 

 6, Oct., 1850, p. 2S3, as Ncbulipora lens). {Fisinlipora lens 

 Whitfield, Ann. Rept. Geol. Wise, for 1877, p. 69; Mont, cir- 

 cularis James, Paleontologist, No. 6, Sept. 12, 1882, p. 46; 

 Calloporella harrisi Ulrich, Jour. Cin. Soc. Nat. Hi.st., vol 6, 

 1883, p. 91.) 



Locality. — Oxford, Blanchester, Westboro, and other places 

 in Clinton, Warren and Butler counties, Ohio; Wisconsin; 

 Wales. 



Remarks. — This species is well characterized by its circu- 

 lar form and the regular arrangement of the cells in curved 

 lines. The form has a wide distribution, for there can be 

 scarcely a doubt but that the forms from Ohio are the same 

 as those from Wales and Wisconsin. Ulrich's species does 

 not differ in any essential character from ciycularis as defined 

 by Mr. James, and that species is certainly the same as lens of 

 McCoy, and F. lens of Whitfield. 



9. — M. DUBi.v Ulrich (.sp.) 1890. 



Corallum discoid; "upper surface with the usual style of 

 cell aperture;" lower surface with an epitheca; corallites 

 direct, circular, with slightly wavy walls; interstitial cells 

 comparatively few and small, situated at the angles between 

 the corallites ; tabulae horizontal and complete in both kinds 

 of corallites, but more clo.sely set in the small than in the 

 large ones; spiniform tubuli wanting. (Geol. Sur. of Ills., 

 vol. 8, 1890, p. 459, as Diplotrypa :' dubia) 



Locality. — Wilmington, Illinois. 



