ii6 THE GENUS MONTICULIPORA. 



E. and H., we have to deal In M. Daiii, E. and H., with nothing 

 more than a well-marked variety oi Af. ramosa, D'Orb. 



Horizon and Locality. — Abundant in the Cincinnati Group, 

 Cincinnati, Ohio. Both of the two varieties, rngosa, E. and H., 

 and Daiii, E. and H., occur associated in the same beds with 

 the type-form of the species. 



Monticulipora (Heterotrypa) nodulosa, Nich. 

 (PI. I. figs. A-Ad.) 



CJhvtdcs ? nodulosus, Nicholson, Quart. Jour, Gcol. Soc, vol. xxx. p. 506, PI. 



XXIX. figs. 9, 9^-, 1874. 

 C/icetetes noditlosus, Nicholson, Pal. Ohio, vol. ii. p. 200, PI. XXI. figs. 10, 



lortr, 1875. 

 Chcetetes nodii/osi/s, Nicholson, Ann. and Mag. Nat. Hist., ser. 4, vol. xviii. p. 



87, PI. V. fig. 3, 1876. 



Spec. CJiar. — Corallum minute, dendroid, of small cylindrical 

 stems, which vary from two-thirds of a line up to one line in 

 diameter, and branch dichotomously at intervals of about two 

 lines. The surface exhibits numerous conical or transversely 

 elongated tubercles or " monticules," which are placed at dis- 

 tances of about half a line apart. The callces are oval, with 

 their long axes corresponding with the long axis of the corallum, 

 separated by numerous smaller Interstitial apertures. The 

 corallltes are vertical in the axis of the corallum, and only 

 bend outwards In the extreme portion of their course, so that 

 the axis bears an unusually large proportion to the circumfer- 

 ential portion of the stems. Their outward inclination Is also 

 very slight, so that they open obliquely on the surface. In the 

 centre of the branches the laro;e corallltes are thin-walled and 

 polygonal, but in the short outer part of their course they 

 become thickened, and assume an oval shape. They are 

 separated from one another by numerous small corallltes, the 

 form of which Is anofular or sub-anirular. The tabula are com- 

 paratlvely few in number, but increase in amount as the surface 

 is approached, being always complete and approximately hori- 



