26 



Cincinnati Society of Natural History. 



culated, is called Monticulipora (Perenopora) molesta, and another 

 allied form is called Monticulipora (Heterotrypa) Uawsoni. 



His Chetetes gracilis is now Monticulipora (Heterotrypa) gracilis; 

 Chetetes nodulosus, Monticulipora (Heterotrypa) nodulosa ; Chetetes 

 jamcsi, Monticulipora (Heterotrypa) jamesi, and a closely allied form 

 is Monticulipora (Heterotrypa) implicata. 



The form which he referred to, Chetetes dalei, in the Ohio Survey, 

 and which is so well known here as Monticulipora dalei of Edwards 

 and Haime, he now refers to Monticulipora ramosa, D'Orbigny, 1850, 

 and hence the rugose form of the same species is called M. ramosa, 

 var. rugosa. I have never s Q .en the work of D'Orbigny, but I can not 

 help expressing my surprise at this identification, at so late a day, 

 though it is probably correct. 



The form which he described as Chetetes approximatus, in the Ohio 

 Survey, he now saj'S is a synonym for Monticulipora dalei of Edwards 

 and Haime, but he regards it as merely a variety of M. ramosa. He has 

 certainly been very much misinformed about this species, for he says 

 that it occurs associated in the same beds, at Cincinnati, with M. 

 ramosa and M. ramosa, var. rugosa, and possesses only a slight ex- 

 ternal difference, with a complete agreement in internal structure, both 

 tangential and longitudinal sections, showing features precisery similar 

 to those exhibited by corresponding sections of typical examples of 

 M. ramosa. 



In 1875, the w T riter said, " Chetetes approximatus of Nicholson, 

 which should be written Monticulipora approximata, is never, so far as 

 my observation has extended, covered with elongated tubercles, as in the 

 rugose variet}^ of the dalei. Moreover, the approximata is found abund- 

 ant in the rocks from 300 to 350 feet above low water mark, where it 

 is very rare to see a piece of the dalei, while the latter abounds in the 

 rocks from 350 to 400 feet above low water mark, where the former is 

 comparatively quite as rare as the latter is in the rocks first mentioned."* 

 The difference in the range of the two species is, however, greater than I 

 then stated. 



The M. approximata (M. dalei) maybe found in great abundance be- 

 low the Eden Park reservoir, and about midway of the side hill below 

 the Park, at an elevation of from 200 to 300 feet above low watermark. 

 Clusters may be collected nearly a foot in diameter, and eight inches in 

 height. Specimens too large to go in a peck measure are not uncommon, 

 and } T et, throughout this entire range, I have never collected a specimen 



* Cin. Quar. Jour. Sci-, vol. ii., p. 36£. 



