133. CONTRIBUTION TO 



with low radiating ridges about the nodes, nineteen arm bases and tubercular 

 ventral plates. 



The width of the body is about once and a half the depth. 



The ventral tube is small and tuberculous about the base. 



The worn condition of the specimen precludes further description. It dif- 

 fers from D. arrosus in the possession of three more arm bases, but its close 

 resemblance otherwise does not warrant its specific separation. 



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

 Greene. 



S T E M M A T C R I N U S ? V E R Y I , N. Sp. ( Rowley) 



Plate 38. Figs. 7, 8 



Body hemispherical. Plates very thick and heavy as in Barycrinus. The 

 underbasals form a solid pentagonal disk, not flat as in Prof, Trautschold's 

 species, but decidedly convex. 



Owing to the worn condition of our type specimen, the columnar scar is 

 obliterated but the small pentagonal ? canal is present surrounded by a narrow 

 ring of silicious material as if the deposition of calcareous matter about a mi- 

 nute stem had incorporated it in the plate substance. 



The basals are large and pentagonal, two of them being somewhat larger 

 than the other three. The upper angle of one af these two larger plates extends 

 somewhat higher than that of the other. 



The tirst radials are nearly twice as broad as long, pentagonal and with a 

 concave articular facet quite the full width of the plate and directed upward. 

 This is contrary to the straight articulating line of S. ceriiuus. 



The plates are apparently smooth. There is no anal plate. 



The only other described species of this genus is from the Subcarbiuiferous 

 of Russia. 



Our species comes from the Subcarboniferous (probably Keokuk group) of 

 Cumberland county, Kentucky, and was found by Mr. Charles Very, of New 

 Albany, Ind. 



The specif!:; name is for the discoverer. 



In the great thickness of the plates, concave articular facets of the primary 

 radials and the convex basal region, our species differs from Stemmatocrinus 

 and in the same respects even more so from Erisocrinus a genus with hexagonal 

 basal plates. 



The type is in the collection of Mr. G. K. Greene, 



