INDIANA PALEONTOLOGY. 104. 



The plate sutures can not be made out on the specimen owing to the crys- 

 talline character of the test. The interradial processes are strong and project 

 obliquely upward, but are not entire. 



The ventral star formed by the radial grooves is shown in the illustration. 



The anal opening and spiracular canals pierce the processes as seen in 

 figure 23. 



From the Niagara group on Big Creek, near Big Creek P. O., Jefferson 

 County, Ind. Collection of G. K. Greene. 



STEPHANOCRINUS GEMMIFORMIS, Hall, Rowley. 



Plate 32. Figs. 24, 25. 



Unlike most of the other species of this genus, gemmiformis is subglobose 

 and mimics Pisocrinus. 



The three basal plates are broad and so are the radials. The interradial 

 processes are short. 



The plate ornamentation seems to be fine, radiate lines. The radial grooves 

 remind one of the ambulacra of blastoids. 



The stem base is almost minute. 



From the Niagara group at Waldron, Indiana. Collection of G. K. Greene. 



STEPHANOCRINUS OSGOODENSIS, Miller, Rowley. 



Plate 32. Figs. 26, 27. 



This is almost an ellipsoid in outline. The interradial processes are di- 

 rected upward. The plate outlines are obliterated by the eystalline structure. 



The base is triangular and the columnar scar, round. The radial depres- 

 sions and central pit are well shown in the drawing. 



Found by Mr. John Hammell of Madison, Ind., in the Niagara group, on 

 Big Creek, near Big Creek P. O., Jefferson County, Indiana. Now in the col- 

 lection of G. K. Greene. 



STEPHANOCRINUS, HAMMELLI, Miller, Rowley. 



Plate 32. Figs. 28, 29, 30. 



This form is rounded with a handle-like base. 

 The interradial processes are apparenly short. 

 The ornamentation is fine longitudinal lines. 



