48 Tlie Paleontologist. \Sept. 12, 



he gives it (approximata) as a synonym for M. sp. ramosa, var. dalei, E. 

 & H. 



Found most abundant at Cincinnati, between 200 and 300 feet above 

 low-water mark of the Ohio river. 



MoNTicuLiPORA {Hetcvotrypa ?) eccentrica, sp. nov. James. 



Corallum, piano, or slightly concavo convex ; subcircular in outline, 

 from one to two lines in diameter, half a line or less in thickness; gener- 

 ally found adhering to or slightly embedded on the surface of fragments 

 of rock, often base upward, and, when thus presented, the base is seen 

 to be flat or slightly concave, with a very thin epitheca, showing fine, 

 delicate concentric lines, having an eccentric starting point near the 

 margin, resembling, somewhat, the beak and lines of some small brachio- 

 pods; it shows, also, fine radiating lines from the eccentric point; the 

 bases of the corallites may be seen through the epitheca; the margins of 

 some specimens have a serrate appearance, caused by the projections of 

 the cell apertures of the upper surface. The upper surface is gently 

 convex, and occupied by circular calices, seven or eight in the space of 

 one line, of uniform size, or a few of the center ones slightly larger than 

 on other parts, and more or less of minute interstitial tubes. Aper- 

 tures of cell walls, thin. 



In tangejttial section the tubes are oval, walls somewhat thickened, 

 and distinctly separated, and filled with a dark substance, the spaces 

 between occupied by curved or angular lines joined to the tube walls. 

 Vertical section the corallities curve slightly at the base, then take an 

 oblique course to the upper surface ; tabulje horizontal in the small tubes, 

 but mostly oblique in the larger. Owing to the small size and thinness 

 of the corallum, it is difficult to make altogether satisfactory sections of 

 the interior of this species. 



The examples used for this description were found by the writer near 

 Columbia Avenue, Cincinnati, some 200 feet above low-water mark of 

 the Ohio river. 



MoNTicuLiPORA {Hcterotrypd) winchelli, sp. nov. James. 



Corallum subcircular in outline at the base, spreading to a thin edge, 

 and rounding upward and over the apex, somewhat dome-shape. Base 

 attached to shells, generally Brachiopods. or other foreign substances; 

 when removed by decay of the shell, or otherwise, the bases of the cor- 

 allites show very thin walls. In a fractured section the corallites are 

 seen to curve slightly outward from the base, or take a perpendicular 

 course so as to open direct at the surface. Apertures of cell walls, 

 thin; 8 to 10 polygonal or subcircular calices, 'with more or less inter- 

 stitial tubes in the space of one line ; " monticules," slightly, or not at all, 

 elevated, distributed over the surface, occupied by groups of calices 

 somewhat larger than the average. 



