1 882.] The Paleontologist. 49 



A tangential section shows two series of tubes, the larger, and much 

 the most numerous, are oval or subcircular. with thin walls, the smaller, 

 angular, of various shapes, and crowded between the others ; ' ' spini- 

 form" corallites numerous, showing, in most cases, minute circular open 

 centres. 



In vertical section the cell walls are seen to be irregularly thickened 

 in places, and sometimes of a duplex character ; some dividing at different 

 heights, forming cells of full size at the surface; the cells so formed are 

 the most closely tabulate at the narrow parts, but the tabulae become the 

 same as in the larger tubes as the tubes widen to the same dimensions. 

 Tabulje complete,but not horizontal, passing at various angles from one wall 

 to the other of the tubes, in some cases curving regularly downward in the 

 middle, or forming an acute angle. 



The example used for this description is a little over an inch in diameter 

 across the base, and one half an inch in height, and was found near Lynch- 

 burg, Highland Co., Ohio, in the upper part of the Cincinnati Group, by 

 VV. P. Cleaveland, Esq., who made, and kindly presented to the writer, a 

 splendid microscopic slide of sections of the species, and at the same 

 time proposed the name of Prof. Alex. Winchell, of Ann Arbor, Mich., for 

 its name, in whose honor it is given. 



In external form and features this species resembles, quite closely, M. 

 sckvynu or var. hospitalis, Nicholson, but the internal structure is very 

 different. 



MoNTicuLiPORA {Hctcvotrypa ?) cleavelandi, sp. nov. James. 



Corallum somewhat lobate, or amorphous, throwing off flattened or 

 cylindrical branches in various directions; rounded "monticules," more 

 or less conspicuous, distributed over the surface about one line apart 

 from center to center, occupied by calices that are larger than on other 

 parts; lo to 12 calices, polygonal or subcircular in shape, in the space 

 of one line. No minute interstitial pores observed at the surface. 



A tangential section shows the polygonal form of the tubes with 

 tolerably thick walls, and, sparingly, small angular and spiniform cor- 

 allites. 



In longitudinal and vertical sections the tube walls, in the axial por- 

 tion, are seen to be somewhat tortuous and very thin, and the tubes in- 

 clined gently outward, but curve more rapidly as they approach the 

 surface, and open in a slightly oblique direction, or nearly at right 

 angles with their course in the center of a cylindrical branch ; tabuhie 

 complete and numerous throughout, but more closely set toward and 

 near the surface than centrally ; in some cases direct across the tubes, in 

 others curved downward or upward in the middle, and others more or 

 less oblique. 



A transverse section of a cylindrical branch, shows, in the axial region, 

 the tubes as polygonal and thin walled, and, sparingly, the smaller 

 angular tubes ; the outer portion of the section shows the corallites ver- 

 tically with the walls somewhat thickened. 



