130 Cincinnati Society of Natural History. 



six or eight lines; surface witliout tuberosities. Apertures of cells, 

 on the upper portion of the colony, usuall}^ polygonal, sometimes sul)- 

 circular, and equal in size, about five occupying the space of one line; 

 at the base the calices are generallj^ larger and oval; walls of tubes 

 moderatel3^ thick, with the exterior, as is seen in fractured examples, 

 strongl}' wrinkled or annulated. Longitudinal sections show the tubes 

 radiating from the obtusely pointed base in curved lines to the surface. 



The walls are flexuous, and of variable thickness ; no tabulre were ob- 

 served in any of the tubes. Sections of this kind clearly show that the 

 tubes were multiplied by gemmation. Transverse sections show the 

 calcite filling the tubes divided into four parts by very distinct cruci- 

 form lines. This feature, occurring in a number of forms, is a very 

 peculiar one, and is as yet not understood. 



This species appears to have been gregarious, since it is almost ex- 

 clusively found in what are termed " pockets." 



I know of no form from the Cincinnati rocks with which this species 

 could be confounded. It is probably most nearly related to C. petro- 

 politanus, Pander, but the distinct groups of larger tubes, the hemis- 

 pherical form, and the well developed tabulae in that species, will am- 

 ply sei've to distinguish them. 



Formation and locality: rather abundant in the lower part of Cincin- 

 nati Group, at Covington, Ky., and at Batavia, Ohio. 



CnyETETES ELEGAxs, u. sp. (Plate XII., figs. 12, 12a.) 



[Kty. —■Eleoa7is, elegant.] 



Bryozoary free, growing in exceedingly thin, circular expansions, 

 not more than one fourth of a line in thickness, and from one half an 

 inch to one inch and a half in diameter; the expansions, on account 

 of their great tenuity, are usually much flattened bj^ pressure, l)ut 

 originally, as is seen in well preserved specimens, they were rather 

 convex. Surface exhibiting numerous, rather low, rounded tuberosi- 

 ties, the bases of which are in contact or nearly so; the monticules are 

 arranged in diagonally intersecting rows, and have a diameter averag- 

 ing about two and one half lines; the cells which cover their sides and 

 summits gradually increase in size, until thc}^ have attained a diameter 

 at the summit that is equal to nearl}^ twice that of the cells which are 

 situated in the depression between the tuberosities. Cells with moder- 

 ately thick walls, arranged in diagonal lines, the regularity of 

 which is slightly disturbed by the increased size of those occupying 

 the monticules; apertures diamond-shaped or approximately hexago- 



