Manual of the Paleontology of the Cincinnati Group. 



69 



lines: rarely massive: surface with numerous prominent conical or 

 elongated monticules, one-half to one line apart, of corallites not 

 differing in size from the average: calices polygonal, thick-walled, 

 sub-equal with a few interstitial corallites : corallites of two kinds, the 

 larger more numerous, thin-walled and polygonal, mostly with tabulae 

 forming a series of lenticular vesicles along one side of the visceral 

 chamber and a moderate number of straight or slightly concave 

 tabulae extending to the opposite wall ; smaller corallites compara- 

 tively few, angular, varying in size, and with numerous, complete, 

 horizontal tabulae; no spiniform tubuli. (Genus Montic, 18S1, p. 224.) 



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



Remarks. — It is to be noted that this species is similar to the one 

 following in its outward appearance. It furnishes an example of the 

 difficulty of accurately settling the specific name of a species with- 

 out the examination of minute sections. In a previous paper, * 

 indeed, both were placed together, but it is now deemed best because 

 of the difference in internal structure to separate them. The presence 

 of vesicular tabulae in this form distinguishes it from the other (mamtnu- 

 lata as here considered) which has horizontal and complete tabulae. 



44. M. MAMMULATA D'Orb., 1850. 



( orallum in undulated expansions, two to six lines or more thick, 

 often consisting of several layers of corallites, diverging from an 

 imaginary, but not a definite plane and opening on both sides ; occa- 

 sionally massive ; surface with rounded, conical or elongated monti- 

 cules, either conspicuous or only slightly raised ; these occupied by 

 corallites either slightly larger or slightly smaller than the average : or 

 else the sides with full-sized, and the summit with smaller corallites ; 

 calices of two kinds: large ones polygonal, or sub-polygonal with 

 moderately thickened walls at the surface : small ones moderately 

 numerous, intercalated between the larger tubes, variable in size and 

 shape, but always angular or sub-angular ; spiniform corallites variable 

 in number ; tabulae of large corallites few and remote : of small coral- 

 lites numerous and closely set, in both cases all complete and 

 approximately horizontal. (Prodr. de Pal., vol. i, 1850, p. 25 ; 

 Nicholson, Genus Montic, 1881, p. 104.) 



Locality. — Cincinnati and vicinity: generally distributed through- 

 out the group. 



• Jour. Cin. Soc. Nat. Hist. vol. 11, 1888, p. 16. 



