INDIANA PALEONTOLOGY. 83. 



From the Upper Devonian beds near Charlestown, Ind, Collection of Mr. 

 G. K. Greene. 



NUCLEOCRINUS GREEN EI. M. <t G., Rowley. 



Plate 27. Figs. 12. 13. 14-15. 



This blastoid is very variable in size, some specimens of which are even 

 larger than N'. Angalaris. 



In a general way it is somewhat longer in proportion to the width than 

 iV^ Angttlaris, but otherwise very closely resembles it. A cross section shows 

 it quite as pentangular as the former. 



The base is probably never concave, being flat or slightly convex. 



The anal interradial area is wider than the other four areas and the trian- 

 gular areas are more pronounced than in Angularis. 



The ventral side is flat, but probably never concave. 



The spiracles and anal openings are not otherwise than in X. Venustus 

 and X. Angularis. 



The ambulacra stand out on sharp ridges. 



Upper Devonian beds near Charlestown. Ind. Collection of Mr. G. K. 

 Greene. 



NUCLEOCRINUS STICHTERI, N. Sp. (Rowley). 



Plate '21. Figs. 9. 10-11. 



Body elongate, somewhat contracted at the lower ends of the ambulacra 

 and more inflated toward the summit. 



A cross section would give an outline circular as in typical Verneiiili. 



The base is concave and the little foot-like projections in which the lower 

 ends of the ambulacra rest, point outward and are quite prominent. 



The radial plates are about one-sixth of the entire body length. 



The ambulacra are narrow and hardly above the general convexity. The 

 interambulacral triangles are hardly outlined. 



The anal plate is but little above the surface, even near the summit. 



The anal opening is more or less round, and there are ten spiracles. 



The interradial plates are about five-sixths of the body length. 



