50 TJie Paleontologist. \Sept. 12, 



The specimens used for this description were found in the upper part 

 of the Cincinnati Group, near Lyncliburg, Highland county, Ohio, by 

 W. P. Cleaveland, Esq., in whose honor the name is given. The largest 

 example is nearly 2^ inches, by 2 inches in size, showing where the 

 cylindrical and flattened branches have been broken away. 



The writer is indebted to Mr. Cleaveland for three excellent 

 microscopic slidesof sections of this species, cut from different specimens, 

 showing some variations in the internal structure, owing, probably, to 

 the different angles at which they were cut, and different thickness of the 

 sections. 



MoNTicuLiPORA {Mouotrypd) wortheni, sp. nov. James. 



Corallum consisting of cylindrical or flattened stems, from one to two 

 lines in diameter, branching at irregular intervals, sometimes dichotom- 

 ously ; surface occupied by small, prominent monticules, arranged in 

 alternating, longitudinal rows, about one line apart ; calices subcircular 

 or angular, from 10 to 12 in the space of one line. Slopes of monticules 

 occupied by calices of the ordinary size or slightly larger, but the apices 

 are, apparently, solid. No interstitial tubuli observed in the specimens 

 examined. Margins of apertures of corallites tolerably thick. 



In a longitudinal section of the interior the tube walls are very thin, 

 simple and somewhat wavy or tortuaus, with a gentle outward inclination 

 each way from the axial part, but near the surface the outward curve is 

 more rapid, and the walls much thickened, showing a duplex character ; 

 the tubes opening at the surface more or less obliquely. No tabulffi ob- 

 served in the central region, and but few in the outer part of the thick- 

 ened walls. In tangential section the cells are suboval, or subcircular, 

 thick walled, and each surrounded b}- a distinct open space : faint indi- 

 cations of small "spiniform" corallites distributed, sparsely, at the angles 

 of some of the larger tubes. A transverse section shows the very thin 

 walls of the corallites in the central region, of various angular shapes, 

 and the sudden thickening of the walls, and duplex character, and few 

 direct, horizontal tabulse near the surface. 



Externally., at first sight, this species resembles M. ramosa, D'Orbigny 

 var. dalei, E. & H., but when examined under a magnifier the marked 

 difference is apparent. Internally, they differ widely. 



The specimens used for this description were found by W. P. Cleave- 

 land, Esq., near Lynchburg, Highland Co., Ohio, in the upper part of 

 the Cincinnati Group. 



Named in honor of the distinguished geologist and paleontologist, 

 Prof. A. H. Worthen, Director of the Illinois Geological Survey. 



MoNTicULiPORA {Monotrypa) welch i, sp. nov. James. 



The corallum of this species varies greatly in outline and surface mark- 

 ings ; base expanded and subcircular in outline ; the under side flat or 

 more or less concave, covered with a thin epitheca concentrically wrinkled 

 and finely striate; outer margin of the corallum thin at the base ; rise of 



