THE PALE ONTOLOGIST. 



No. 7. ^ CINCINNATI.-U. P. JAMES. [ApriM6, 1883 



DESCRIPTIONS OF NEW SPECIES OF FOSSILS FROM 

 THE CINCINNATI GROUP, OHIO AND KENTUCKY. 



BY U. P. JAMES. 



GENUS MONTIOULIPORA. D'Orbigny. 



MONTICULIPORA KENTUCKENSIS, Sp. IIOV. JamCS. 

 (Plate II.. figs. 1, la and 1&.) 



The fragments of the corallum of this species used for this description 

 are cylindrical stems, about |th of an inch in diameter, a little more or less, 

 branching dichotomously sometimes : in one case a flattened subcircular 

 form, throwing off branches in different directions, with a central open- 

 ing, indicating an anastomosing habit of growth. Calices polygonal, of 

 various irregular forms, and somewhat variable in size ; about 8 cells in 

 the space of one line : low monticules distributed irregularly over the 

 surface, in some cases occupied by calices of the ordinary size on other 

 parts. No interstitial tubules observed at the surface, but all the 

 specimens collected are more or less weathered, so as to prevent 

 determining this point satisfactorily. " Walls of tubes comparatively 

 thick at the apertures. 



A long section of the interior shows the tubes in the center as diverg- 

 ing very slightly from the longitudinal direction of the stem, but the 

 outward inclination increases as they advance, some of them opening 

 obliquely at the surface, others at right angles with their course in the 

 axial region: some of the walls bifurcate as they near the surface, forming 

 tubes pointed at their bases, but with apertures of full average size. 

 The tube walls are comparatively and evenly thick throughout, and the 

 cells strongly tabulate from the center to the surface, but immediately at 

 the surface more closely than the axial region; this is particularly the 

 case in the pointed tubes formed by the division of the walls. In some 

 cases the central tube is nearly twice the size of adjoining ones. The 

 tabulae pass directly across the tubes from wall to wall. 



The tangential section shows the thick walled angular cells, with some 

 variation in size, and occasionally what might be considered a " spini- 

 form" corallite. 



This species differs from other associated slender branching corals, 

 from the Cincinnati Group, in the equally thick tube walls and tabulae 

 throughout, instead of very thin walls and remote or no tabulae centrally, 

 as in the former; also in the surface features. 



Collected by my son, Joseph F. James, near Paris, Ky. 



