256 



Cincinnati Society of Natural History. 



busta, n. sp.) is next described, while two other ramose species, the 

 fifth and sixth, must for the time being remain unpublished. 



Formation and locality : Cincinnati Group. This species I found to 

 be abundant in a single layer at McKinney's Station, on the line of the 

 Cincinnati Southern R.R., where, after crossing the Trenton exposures 

 on each side of the Kentucky river, the observer again meets with the 

 Cincinnati Group. Judging from the associated fossils, the strata 

 exposed at McKinney's are equivalent to those near the tops of the 

 hills about Cincinnati, O. This is made the more probable by the fact 

 that a single fragment was discovered at Cincinnati, by Mr. Ernst 

 Vau pel, at an elevation of 375 feet above low- water mark in the Ohio 

 river. 



As some of the genera proposed by me in my scheme of classification 

 {ante p. 149, et. seq.), have not yet been fully established by a descrip- 

 tion of the type species, and because my memoir is unavoidably 

 divided into parts, I have thought it advisable to anticipate, in a 

 measure, the parts yet to be published, by noting those species already 

 described, which I propose to refer to one or the other of the genera in 

 question. Besides, I wish to publish a few notes on other points 

 whereon my views differ from those of Dr. Nicholson. 



Of the twelve species referred by Nicholson, to Monotrypa (' l Genus 

 Monticulipora," 1881), only the four species M. undulata, Nicholson, 

 M. p etas if or mis, Nich., M. w inter Nich., and 31. irregularis, Ulrich, 

 can be considered as unquestionably congeneric. 31. calceola, Miller 

 and Dyer, and 31. clavacoidea, Nicholson, I regard as species of 

 doubtful position. Of the six other species 31. briar ea, Nich., M. 

 pulchella, E. and H., and 31. quadrata, Rominger, are congeric with 

 31. cequalis, Ulrich, the type of the new genus 3Ionotrypella ; 31. 

 pavonia, D'Orb., is a Ptilodictya, 31. discoidea, Nicholson, should be 

 referred to Amplexopora, and 31. tuberculata, E. and H., is one of four 

 species upon which the new genus Spatiopora is founded. (The other 

 three species, among them the one which is selected as the actual 

 type of the genus, are as yet undescribed). Chaitetes subglobosus, 

 Ulrich (Cin. Gr.), and Ch. monticulatus, Hall (Lower Helderberg), 

 are t} 7 pical species of Monotrypa. 



The genus Batostoma is founded upon 31. implicata, Nicholson.* 

 The genus also includes 31. jamesi, Nich., and 31. girvanensis, Nichol- 



* This species I named in my Cat. of the Foss. of the Cin. Gr., but did not figure or de- 

 scribe it, consequently I have no right to claim the species, although Dr. Nicholson has seen 

 fit to credit me with the name. 



