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Cincinnati Society of Natural History. 



ularly rounded, and the smaller "interstitial" ones of various shapes, and 

 a few of what may be "spiniform corallites" or hollow tubuli. 



In the feature of the numerous interstitial tubes, and thickened walls 

 of the outer portion of the corallites, as seen in long section, and the ap- 

 pearance of the tangential section, this species resembles M. ulrichi 

 Nichn, but in all other features it is materially different, especially in 

 the prominent, conspicuous monticules, and tabulation of the two sets of cor- 

 allites. Prof. N. says, in regard to M. ulrichi: 11 The surface is smooth and 

 destitute of monticules,' 7 and that the interstitial tubes are "much more 

 closely tabulate" than the larger corallites, which is not the case in M. 

 ohioensis. Another decided difference, not so important perhaps, is the 

 much more robust habit and larger size of specimens of ohioensis than 

 ulrichi. 



Position and locality: Cincinnati Group: Upper side of Columbia 

 Avenue, Cincinnati, about 200 feet above low water mark of the Ohio 

 Kiver. It may be found at other localities — probably is — but this is the 

 one where the writer found the type forms, and many variable duplicates. 



MONTICULIPORA FALESI, Sp. nov. 

 (Plate VII., figures 2 to 2d.) 



The corallum of this species varies in outline from an oval base and low, 

 convex upper surface to a round base and steep, conical slopes to a sn.all, 

 circular apex. (See figures 2 to 2d ) The specimens with low and mod- 

 erately elevated convex upper surface seem to be young individuals. 

 (Figures 2a to 2d.) The base margins are quite thin and sharp. The 

 surface is occupied by circular and polygonal calices and stellate m»culse. 

 The maculae are irregularly distributed over the surface, and very little 

 — some not at all — raised above the general surface. Walls of tubes thin 

 at the aperatures. There are about seven or eight calices to one-tenth of 

 an inch between the maculae, but on the maculae they are considerably 

 larger. In some cases, the maculae seem to be sub-solid in the center ; 

 others have a larger calyx occupying that position. A few interstitial 

 tubes noticed, and a small number of "spiniform corallites." 



On the under part of the base of the coral is a regularly outlined conical 

 groove extending nearly across the middle of the longest diameter, to a 

 pointed apex; the concave surface of the groove is covered with very 

 delicate, crowded, transverse striae (see figure 2a); this feature (the conical 

 groove) is constant in all of seven examples examined. A delicate epi- 

 theca probably covered the entire base, but has, apparently, been weathered 

 away. The conical groove seems to be altogether normal, and is a marked 

 feature of the species. 



