INDIANA PALEONTOLOGY. 12. 



This is the most remarkable form of this genus that I am acquainted with, 

 differing from all heretofore described species, in the mode of growth, and the 

 manner of budding. In the most common forms the parent cup seems to in- 

 crease by prolific growth, and from the superior margin a number of buds ap- 

 pear, five or more sometimes sets forth closely connected, or, in some examples 

 widely separated, and while this new process of budding is going on, a new 

 growth springs up from the center of the calix, and continues a short distance 

 and ceases; then new buds set forth from the margin on the opposite side from 

 the former ones; this is not the case in all corallums, some examples after bud- 

 ding, set forth a new growth from the calix, and shows no signs of budding; 

 in these examples, the calix is deep, with numerous coarse granulose septa, and 

 the cyst are confined to the bottom of the calix. 



Found in the Upper Devonian, (Hamilton group) two miles north-west of 

 Charlestown, Indiana. Now in the collection of the author. 



C Y S T I P H Y L L U M G E M M U L A, N. Sp. 



Plate 6. Figs. 8, 9. 



Corallum simple, or composite, turbinate, straight or regularly curved- 

 Acute at the base of attachment, gradually, and regularly expanding in diame- 

 ter to the calix. Height, twenty- millimeters. Diameter of calix ten millimeters. 

 Depth, ten millimeters, somewhat funnel-shaped. Near the margin, and for a 

 short distance below, the cysts are small and numerous, as they approach the 

 bottom of the calix they bec#me slightly larger, and are covered with fine, 

 rather indistinct stria?. Exterior with sharp constrictions and wrinkles, caused 

 by periodical growth. TVhen decorticated, the surface cysts appear somewhat 

 larger than they do in the calix. From one cup, there are two corallites, equal 

 the diameter of the parent cup, (not very high) from one of these, another 

 small bud is attached. 



The short corallum, and wide calix, and the short, broad corallites, make 

 this easily recognized from all other species. 



Found in the Upper Silurian, (Niagara group) at the Bear Grass Creek 

 Quarries, near Louisville, Kentucky. Now in the collection of the author. 



C Y S T I P H Y L L U M OSSICULUM, N. Sp. 



Plate 6. Figs. 5, 6, 7. 



Corallum simple, or composite, increasing by calicular gemmation, turbi- 

 nate in the young state, but becoming cylindro-conical in the more mature 

 growth. Height varying in different individuals from one to four and a half 



