loo Cincinnati Society oj Natural Ilisiory. 



composed of variously-sized polygonal corallites, in close 

 contact with one another throughout their entire length. 

 The walls of the corallites are not excessively thickened, and 

 they are so completely amalgamated in contiguous tubes that 

 even under the microscope the original line of demarcation 

 between the tubes can be made out with difficulty or not at 

 all. The large tubes are usually from two to three lines in 

 diameter, though occasionally considerably smaller than this ; 

 and the smaller corallites are of all sizes. Septa marginal, in 

 the form of obtu.se longitudinal ridges, which vary in number 

 from 20 to 40, do not extend to any distance into the visceral 

 chamber, and are not divisible into an alternating longer and 

 shorter series. Tabulae strong, horizontal and complete, 

 about half a line apart or sometimes closer." (Pal. Tabulate 

 Corals, 1879, p. 200.) 



Locality. — Cincinnati or places in vicinity (?). 



Remarks. — This species was establi.shed by Nicholson to 

 include the coral described by Hall, Billings and others as 

 Coluninaria alvcolata. It is not that species, however, and Dr. 

 Nicholson has, therefore, given it this new name. It has been 

 recorded from Cincinnati by Mr. Ulrich, (Cat. Foss. Cin. Gr., 

 1880), but Nicholson says it is mainly a Trenton form. 



[TO BK CONTINUED.] 



