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THE PALEONTOLOGIST. 



No. 6. v-t CINCINNATI.-U. P. JAMES. [Sept. 12, 1882. 



The Price of this Nutnher is 25 Cents. 



DESCRIPTIONS OF TEN NEW SPECIES OF MONTICU- 



LIPORA. FROM THE CINCINNATI GROUP. OHIO, 



INDEX, ETC. By U. P. JAMES. 



GENUS MONTIOULIPORA. D'Orbigny. 

 MoNTicuLiPORA {Hetcrotrypd) clintonensis, sp. nov. James. 



The parts of the coraUum found of tins species vary much in shape; 

 some are flattened, undulating expansions, from one to two inches in one 

 direction by three to four inches the other ; fractured specimens show the 

 coraUites springing from an imaginary central axis in an apparently confused 

 manner; taking a slightly outward, tortuous course at first, then curving 

 abruptly and directly to the surface; others are thickened, contorted, amor- 

 phous forms, with the coraUites, centrally, much twisted ; others appear 

 as if subcylindrical branches had been thrown out in places ; transverse 

 sections showing the tubes as curving at first, then radiating in every 

 direction to the surface. Cell apertures of various shapes, the walls being 

 indented or expanded in a very irregular manner ; about eight cells in 

 the space of one line, with more or less small interstitial tubuli at the 

 angled of the larger tubes ; rounded, conspicuous monticules, more or less 

 prominent, distributed irregularly over the surface, about one line apart, 

 from center to center, and occupied by calices of the average size. 



Sections of the interior of a flattened example three eighths of an inch 

 thick, show the walls of the tubes, in the central portion, longi- 

 tudinally, as very thin with remote tabulae, taking a slight outward 

 direction until reaching within a little less than one eighth of an inch of 

 the surface where they make an abrupt curve and pass directly to the 

 surface ; immediately above the curve the walls become much thickened, 

 and the complete tabulae numerous ; a little higher the tabulae are not so 

 much crowded, but higher still they again become more numerous, but 

 not so regular as the first, and so continue to near the surface. Some 

 of the smaller tubes are more closely tabulate than the larger, others 

 not so close. The walls of some of the coraUites divide as they leave 

 the central part just above the abrupt curve, and again higher, all being 

 more or less tortuous. In transverse section of the central part the tubes 

 are angular, thin walled, and none of the small interstitial tubules ; strik- 

 ingly different from the thickened walls above the curve, and show 

 numerous dissepiments. Tube walls of tangential section thick and very 

 irregular shapes, indented or expanded in a remarkable manner ; in some 

 cases appearing three lobed, others four lobed. Section a little below the 



