On the MonticiiUporoids of the Ci7icviiiati Gtoup. i8i 



gonal, of various forms and variable in size. Walls comparatively 

 thick at apertures. No interstitial pores. (Plate 2, figs. Ga,b,c,d) 

 Formation and Locality: Lower Silurian, Cincinnati Group, 

 Paris, Ky. 



29. M. SUBPULCHELLA, Nicholson. 



MonticuUp07'a {Hfftrotrypa) subpidchella, Nich, Genus Montic, 

 134, 1881. 



ChcEtctcs sidpidchdla, Nich. Pal. of Ohio, IL, 196, 1875. 



Heterotrypa subpidchcda, Nich. Ulrich, Jour. Gin. S. N. Hist. 

 VL, 83, 18S3. 



Corallum dendroid ; branches compressed or flattened, some- 

 times partially hollow. Surface nearly smooth, having somewhat 

 stellate maculae, scarcely elevated, and about a line apart, made 

 up of smaller corallites than the average. Calices large and small, 

 all with moderately thick walls, the larger surrounding the maculae 

 of smaller cells. Larger calices circular or polygonal; small ones 

 sub-angular ; spinifnrm corallites few. 



Obs. This species seems to be distinguished from the other 

 dendroid forms by the star-shaped maculae, made up of smaller 

 cells, thickly scattered over the surface of the flattened, sub-frond- 

 escent branches. 



Formation and Locality : Lower Silurian, Cincinnati Group, 

 Cincinnati, O. 



30. M. RAMOSA, D'Orbigny. 



Prodr. de Pal^ont. 25, 1850; Edw. & Haime, Brit. Foss, 

 Cor. 265, 1854. 



ChcEtctcs ra/nosus, Edw. & H. Pol. Foss. des Ter. Pal. 266, 

 1851. Nicholson, Ann. Nat. Hist. ser. 4, XVIH., 88, 1876. 



Ch(ztetes dald, Nicholson. Quar. Jour. Geol. Soc. XXX., 

 501, 1874.; Pal. Ohio H., 192, 1875. 



Alonticidipora [Heterotf-ypa) ramosa, Nich. Pal. Tab. Corals, 

 296, 1879; Genus Montic, no, 1881. 



Cadopo/-a ramosa, D'Orb. Ulrich, Jour. Cin. S. Nat. Hist., 

 v., 252, 1882. 



Corallum dendroid, branches cylindrical or elliptical, divid- 

 ing dichotomously, varying from one to three or four lines in 

 diameter. Surface with numerous conical or slightly elongated 

 monticules, at intervals of one-half a line to one line apart, not oc- 

 cupied by specially large or small corallites. Calices sub-polygonal, 

 the walls thickened at the mouths, the larger calices completely 



