﻿Descriptions of Four New Species of Fossils, Etc. 137 



DESCRIPTIONS OF FO UR NE W SPECIES OF FOSSILS FROM 

 THE CINCINNATI GROUP. 



By U.' P. James. 



(Read June 3, 1884 ) 



GENUS MONTICULIPORA, D'Orbigny. 



MONTICULIPORA OHIOENSIS, Sp. nov. 

 (Plate VII., figures 1 and ia.) 



The numerous fragments found of the corallum of this species vary 

 greatly in size and particular outline. The stems and branches are mostly 

 cylindrical or sub-cylindrical, but sometimes slightly flattened, especially 

 at places of branching. The branches are frequent and irregular, both as 

 to distance apart and angle, but generally dichotomous. Some specimens 

 (rarely) have a tumid form. (See figure la.) The surface is occupied 

 by numerous conspicuous, elevated, rounded monticules, arranged in a 

 somewhat alternate manner, averaging about one -twentieth of an inch in 

 diameter at the base, and a little over or the same distance apart. The 

 surface shows two series of tubes, with tolerably thick walls at the aper- 

 tures; the larger are circular or sub-polygonal, with eight to ten calices 

 in the space of one-tenth of an inch ; the smaller, which are numerous, 

 are round or angular. The calices on the monticules do not vary in size 

 or shape from those occupying the general surface. The size of specimens 

 vary from about three-twentieths of an inch in diameter to twelve-twentieths, 

 and in some cases across the flattened portions at points of branching over 

 one and one-fourth inches. (See figure 1.) 



Longitudinal sections cut through the center of the stems show the 

 tubes as having but a slight outward inclination in the axial region, but 

 they soon curve abruptly at right angles and take a direct course to the 

 surface; the walls of the tubes are thin and wavy in the center, but be- 

 come decidedly thickened, and, apparently, somewhat fused together im- 

 mediately outside of the sharp curve. The tabulae in the axial portion 

 are few or wholly wanting ; but after the tubes curve and approach the 

 surface the tabulae became numerous, passing directly across the tubes, 

 from wall to wall ; the small interstitial tubes are no more closely tabulate 

 than the larger, as far as observed. A transverse section shows the ends 

 of the tubes, in the axial region, as thin-walled and polygonal in shape : 

 but outside of the abrupt curve the tube walls are seen to be thickened, 

 in long section. A tangential section shows the larger tubes to be irreg- 



