Manual of the Paleontology of the Cincinnati Group. 



71 



Locality. — Cincinnati, Ohio. 



Remarks. — This species is readily recognized by its thin, undu- 

 lating corallum, which carries the sub-oval, oval or pentagonal calices on 

 both sides arranged in decussating lines. Some specimens have been 

 found nine inches by four inches, with evidence that they were even 

 larger. Sometimes low monticules are thickly distributed over the 

 surface : some specimens show a pointed base but none show the 

 non-poriferous margin characteristic of Ptilodictya, to which the 

 species has been referred. Considerable difference of opinion has 

 existed in regard to the zoological position of the species, some calling 

 it a coral and some a polyzoan. It is possible that it may really be 

 one of the latter group. 



46. — M. CURVATA Ulrich (sp.), 1882. 



Corallum ramose or frondose, branches flattened ; surface with 

 small, stellate macular, composed of shallow angular cells; ordinary 

 corallites rounded or angular, with moderately thick walls, varying 

 in diameter from x [o to T i l7 inch; corallites polygonal in the outer 

 part of the corallum with thickened walls, apparently completely 

 amalgamated; spiniform tubuli numerous, of moderate size ; corallites 

 in the axial region with thin, flexuous walls, crossed by tabulae one or 

 two tube diameters apart; more numerous in the peripheral region; 

 vesicular diaphragms crowded and developed in nearly all the tubes. 

 (Jour. Cin. Soc. Nat. Hist., vol. 5, p. 242, as Homotrypa cuiTata.) 



Locality — Cincinnati, Ohio. 



Remarks. — This species was in a former article * placed as a 

 synonym under M. frondosa. At present and pending a complete 

 examination of all the described species it is restored to specific rank. 



I 



47. — M. vaupeli Ulrich (sp.), 1883. 



Corallum irregularly twisted, formed of more or less inosculating 

 masses; several inches in diameter, and consisting of convoluted 

 fronds, varying from one and one-half to three lines thick ; surface 

 sometimes smooth, but usually with irregularly arranged small, 

 rounded or conical monticules: the summit of these sub-solid, and 

 each occupied by maculae of small cells : calices circular, arranged in 

 decussating lines, more or less curved around the monticules : gener- 

 ally one or two rows of cells larger than the average surrounding the 



* Jour. Cin. Soc. Nat. Hist. vol. 11, p. 17. 



