84. CONTRIBUTION TO 



The silicified condition of the specimens and their badly weathered char- 

 acter forbid furtlier description. 



This form is somewhat like y^. Ohovatus of Barris, but differing in many 

 particulars, being much smaller. 



It is much larger and longer than X. Ele(/an8, with which it has little 

 affinity beyond that of generic characters. 



The specific name is for our co worker, the artist, Mr. Fred D. Stichter. 



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

 Greene. 



N U C L E C R I N U S IMITATOR, N. Sp., (Rowley. ) 



Plate 27. Figs. 24, 25, 26, 27-28. 



At a hasty glance this blastoid looks strikingly like OrhiiremHeH Nor- 

 wood'/-, in shape and general outline. 



The base is hardly concave, small. The basal plates are mostly hidden 

 beneath the top stem joint. 



The ambulacral "feet"' point downward and the body is greatly lobed at 

 that place. 



The mid-interambulacral triangles form sulcations ; otherwise the interra- 

 dials would be Hat, merely. 



A cross section is pentagonal, but not nearly so strong as in Angularis- 

 The length and width of body are about equal. The radials are about one- 

 tenth the body length. The ambulacra stand out above the interradial lips and 

 are quite broad for NiicleocrhnDi. The anal plate is but little above the sur- 

 face near the top. 



There are ten spiracles and a more or less round anal opening. 



The ventral surface is flat and the central summit opening is covered by 

 small plates. 



The stem is small, as shown by the upper joint and the perforation is 

 minute. 



The ornamentation is lines more or less parallel with the ambulacra. The 

 ambulacral areas are more rounded in this species than in N. Angularh. 



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

 Geo. K. Greene. 



