Manual of the Paleontology of the Cincinnati Group. 



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them ; spiniform corallites numerous, placed on margins of calices or 

 forming apparently closed tubercles : corallites springing from both 

 sides of median axis, forming two laminae, sometimes marked by a 

 calcareous membrane ; oblique and thin walled at first, but soon bend- 

 ing outward and proceeding straight to the surface, the walls there 

 moderately thickened ; larger tubes with incomplete tabulae, forming 

 a series of vesicles on the side of the visceral chamber, which may 

 and may not be connected with the opposite side by horizontal 

 tabulae ; interstitial corallites with numerous, closely set, horizontal and 

 complete tabulae. (Prodr. de Paleont. , vol. i, 1850, p. 25; Nicholson, 

 Genus Montic, 1881, p. 216.) (Choctetes dtcipiens Rominger, Proc. 

 Acad. Nat. Sci. Phila., 1866, p. 116.) 

 Locality. — Cincinnati, Ohio. 



Remarks. — This species grows in much the same manner as M. 

 molesta, dawsoni and mammulata. It may be distinguished from them, 

 however, by its smoother surface and by the presence of a well 

 defined lamina or plate separating the bases of the corallites which 

 open on opposite sides of the corallum. Specimens can sometimes be 

 separated along this lamina. 



50. — M. clintonensis James, 1882. 



Corallum variable, flattened, undulating, thickened or contorted, 

 amorphous and occasionally appearing as if branched ; surface with 

 rounded, more or less prominent monticules of average size, or at 

 times nearly smooth ; calices of various forms, the walls indented or 

 irregularly expanded : corallites more or less twisted and tortuous in 

 the axial region, then curving abruptly to the surface, in the sub- 

 cylindrical branches appearing to curve and then radiate in every 

 direction to the surface : about eight calices in one line ; corallites 

 with thin walls and remote tabulae in the central portion, becoming 

 thicker walled and with more numerous tabulae toward the surface ; 

 interstitial corallites more or less numerous at the angles of the larger 

 tubes, with a variable number of tabulae ; spiniform corallites few to 

 numerous ; in tangential section the corallites have thick walls and 

 are irregular, being indented and expanded, appearing three or four 

 lobed ; below the tangential section the corallites are more regular in 

 shape, and lower still are oval or circular. (The Paleontologist, No. 

 6, Sept., 1882. p. 45.) 



