no THE GENUS MONTICU LIPORA. 



designated by the letter b than it is Hke any of the others. It 

 seems tolerably evident, however, that without a microscopic 

 examination of the actual specimens described by Milne- 

 Edwards and Haime, it must remain an impossibility to de- 

 termine accurately which of the above types formed the 

 basis for their description. Being imwilling to abandon a 

 name so long current and familiar, I have elected to give 

 this title to the present type ; but I must frankly admit that 

 my selection was an arbitrary one, and that the name of 

 M. mam^nulata may ultimately be found to belong to one 

 of the two forms which I shall describe hereafter under the 

 names of M. violesta and M. Dawsoni. In the meanwhile, 

 therefore, the identification of M. mammulata, D'Orb,, must 

 remain a matter of individual preference or individual opinion ; 

 and nothing like certainty can be obtained upon this point 

 until it may be found possible to examine the original types 

 of the genus by means of modern methods. 



Horizon and Locality. — Common in the Cincinnati Group, 

 Cincinnati, Ohio. 



Monticulipora (Heterotrypa) ramosa, D'Orbigny. 



(Fig. 1 8, and PI. II. figs. 2, 2a.) 



Monticulipora ramosa, D'Orbigny, Prodr. de Paleont., t. i. p. 25, 1850. 

 C/icetdes ramosus, Edwards and Haime, Pol. Foss. des Ten Pal., p. 266, 



PI. XIX. figs. 2, 2a, 1 85 1. 

 Montimlipora ramosa^ Edwards and Haime, Brit. Foss. Cor., p. 265, 1854. 

 Chcetdes Dalii, Nicholson, Quart. Journ. Geol. Soc, vol. xxx. p. 501, PI. 



XXIX. figs. I, \a, 1874; Pal. of Ohio, vol. ii. p. 192, PI, XXI. figs. 



I, \a, 1875. 

 Chcetetes r-ai/iosus, Nicholson, Ann. Nat. Hist., ser. 4, vol. xviii. p. 88, 1876. 

 Monticulipora {Heterotrypa) ramosa, Nicholson, Pal. Tab. Cor., p. 296, PI. 



XIII. figs. 2, 2a, 1879. 



Spec. Char. — Corallum dendroid, of cylindrical or elliptical 

 branches which divide dichotomously, and vary from one to, 

 generally, three or four lines in diameter. Surface covered 

 with numerous conical or somewhat elongated '* monticules," 



