Manual of the Paleontology of the Cincinnati Group. 



79 



may be said in regard to Spatiopora montifera. Mr. Ulrich considers 

 this to be separated from other, similar species, by its well developed 

 monticules. 



62. — M. ortoni Nicholson, 1874. 



Corallum forming a very thin crust parasitic on shells of Orthoce- 

 ras, Strophomcna, and fronds of various corals, varying from one-ninth 

 to three-fourths of a line thick, and rarely more than one inch in 

 diameter; surface with numerous rounded or conical monticules, 

 more or less regularly distributed, from one-half a line to a line or 

 more apart, and either solid or bearing calices of the ordinary size ; 

 calices irregular in shape, often indented by one or more tooth like or 

 blunt projections: tss inch in their longer diameter; margins varying 

 in different examples from thin to very thick, and generally studded 

 with small tubercles, giving the surface a granular appearance ; 

 interstitial cells more or less numerous; in the centre of the corallum, 

 the corallites are often nearly vertical to the surface of attachment, 

 but becoming inclined and opening by oblique apertures at the sur- 

 face ; tabular mostly concave or horizontal and fairly numerous, 

 becoming at times incomplete and vesicular at the mouths of the 

 calices. (Quart. Jour. Geol. Soc. London, vol. 30, 1874, p. 513, under 

 C/iceteles; Genus Montic. , 1881, p. 228.) (Ataciopora muUtgranosa 

 Ulrich, Jour. Cin. Soc. Nat. Hist., vol. 2, 1879, P- I22 . : Atactoporella 

 multigranosa Ulrich, Ibid., vol. 6, 1883, p. 254; Ataciopora mundula 

 Ulrich, Ibid., vol. 2, 1879, P- I2 3? Atactoporella mundula Ulrich, 

 Ibid., vol. 6, 1883, p. 252 ; Ataciopora tenella UL, Ibid., vol. 2, 1879, 

 p. 123; Atactoporella schucherti Ulrich, Ibid., vol. 6, 1883, p. 251: 

 Atactoporella typicalis UL, Ibid., vol. 6, p. 248.) 



locality. — Cincinnati, Oxford, etc., Ohio ; Covington, Ky. ; 

 Delafield, Wis., etc. 



Remarks. — The synonomy of this species as given above seems 

 to be somewhat startling. It is the belief of the writer, however, that 

 it is necessary to reduce the so-called species to the rank of synonyms. 

 The changes made by Mr. Ulrich from one genus to another have not 

 made matters any better. There does not seem to be any better way 

 of showing the resemblances between all of the forms than by putting 

 them in parallel columns, which is done below : 



