A CONTRIBUTION TO THE 

 LOWER DEVONIAN FAUNAS OF MARYLAND 



BY 

 DANIEL WEBSTER OHERN^ 



ECHINODERMATA 



Subbranch PELMATOZOA 



Class CRINOIDEA 

 Order CAMERATA 



Family THYSANOCRINIDAE 



Genus THYSANOCRINUS Hall 

 Thysanocrixus eugenius n. sp. 



Plate XXXVI, Figs. 3-5 ' 



Description. — Body medium in size, urn-shaped, truncate dorsally, the 

 infrabasals and the lower parts of the basals forming the base of the body ; 

 wall of body almost straight below arm bases. Infrabasals 5, protruding 

 beyond the periphery of column ; basals 5, largest of the calyx, extremely 

 convex; posterior basal larger than the rest and truncate above; the 4 

 lateral basals hexagonal, angular above ; radials larger than costals, very 

 convex and prominent heptagonal, angular below, truncate above ; costals 

 2x5, very convex, prominent, the first hexagonal, truncate above and 

 below, the second pentagonal, truncate below, angular above, each side of 



^ Manuscript submitted, June, 1907. 



- All references to figures are to the Lower Devonian report of the Maryland 

 Geological Survey in which these plates and text were published. 



