Paleontology of Ihe Cinciiniali Group. 199 



Var. SUBQUADRATA I'lricli, 1882. 



Differs from the type niainl}- in its smaller size, the 

 branches being from one to two lines in diameter. There are 

 also a small number of interstitial corallites occasionally 

 found. Otherwise as in the type. {Mo7ioiry pel/a snbquadrala 

 Ulrich, Jour. Cin. Soc. Nat. Hist., vol 5, 1882, p. 249.) 



Locality. — Osgood, Ind.; Blanchester, Westboro, Jackson, 

 etc., Ohio. 



Remarks. — This form we have previously regarded as the 

 same as AI. quaarata;'^ but in view of the presence of inter- 

 stitial corallites and the smaller size, it has been thought best 

 to regard it as a variety. It is, of course, possible that it may 

 represent the smaller branches of the typical M. quadrata. 



27. — M. VARiANS James, 1878. 



Corallum variable in form, ramose, incrusting or massive ; 

 in the ramose forms, branches irregular, rounded or sub-cylin- 

 drical, digitate ; the massive forms irregular, contorted, flat- 

 tened or lobate, four or five inches in diameter, throwing out 

 shoots in various directions; frondose and celluliferous on 

 both sides; surface smooth; calices sub-circular, oval, or 

 polygonal; walls thick; interstitial cells few to numerous; 

 longitudinal sections show the corallites to be thin-walled in 

 the axial region, but becoming thickened at the surface ; tab- 

 ulae remote, horizontal and complete, those in the interstitial 

 cells not more numerous than in the normal corallites ; tan- 

 gential sections show thin-walled polygonal cells, with an 

 'occasional interstitial cell at the junction of two or more 

 larger ones. (The Paleontologist, No. i, July 2, 1878, p. 2. as 

 ChcBtetes; Ibid., No. 5, June 10, 1881, p. 36.) {Batostoma 

 variable Ulrich, Geol. Sur. 111., vol. 8, i8go, p. 460.) 



Locality. — Blanchester and Clarksvllle, Ohio; Illinois, and 

 Wisconsin. 



Remarks. — This is a variable species, as far as its mode of 

 growth is concerned. The incrusting forms may be young 

 corallums. The species described under the name of Bastos- 

 toma variabilc is undoubtedly the same as J/, varians James. 



'Jour. Cin. Soc. Nat. Hist., vol. 10, 188S, p. 177. 



