INDIANA PALEONTOLOGY. 74. 



MEGISTOCRINUS EXPANSUS, Miller and Gurley. Rowley. 



Platk 24. Figs. 1-t, 15-16 



This little crinoid has a flat basal region, slightly concave about the colum- 

 nar base and beyond the rounded plane, rapidly expanding to the arm region. 



The calix plates are ornamented by radiate low lines, apparently breaking 

 up into granules. 



The arm arrangement is as in other species of this genus, usually sixteen 

 openings. The arm lobes are strong. 



The dome plates are smooth, a few about the ambulacral ridges being finely 

 spinose. The central dome plate is acutely spinose. 



The anal opening is eccentric. 



From the Upper Devonian near Charlestown, Ind., and the specimen fig- 

 ured is the property of Mr. G. K. Greene. 



