48 NEW YORK STATE MUSEUM 



wide interspaces and giving the surface a meshy appearance. Of 

 the nine columns, the mesial one ( radials ) and adjoining ones are 

 smaller than those near the margin, save the marginal ones them- 

 selves which are also small. These ossicles also bore central mucros 

 in the median columns and rods in the marginal ones. The ambital 

 columns are not distinguishable in character from the supramarginal 

 ones in the mature portion of the rays. 



The actinal side is characterized by the very wide lanceolate 

 ambulacral grooves, at the bottom of which the very long, narrow, 

 arm-bone-shaped ambulacrals are seen. Their inner ends are more 

 thickened than, the outer and their straight edges form, with those of 

 the column directly opposite, a very distinct straight ambulacral 

 channel. It appears that the ambulacrals originally were steeply 

 inclined toward each other. The podial pores were between the 

 ambulacrals. The adambulacral plates show the coin-shaped form 

 and arrangement characteristic of the genus and the granulose 

 actinal surface. They are closely arranged, each adambulacral 

 directly opposite and corresponding to an ambulacral plate. There 

 may have been about forty in a complete column. No inframar- 

 ginals have been noticed, the marginal column being formed by small 

 disk-shaped ambitals that bear a central rod. The orals are small 

 triangular ossicles that belong to the column of the adambulacral 

 plates. In the interbrachial area a single subpentagonal marginal 

 plate is seen. 



Horizon and locality. West Hill flags, about 150 feet above 

 Grimes sandstone (Portage beds), Deyo Basin, 2 miles south of 

 Naples, N. Y. 



Remarks. This species is based besides fragments and young 

 individuals on four mature specimens ; two of these show the 

 actinal and the other two the abactinal side. The species is in both 

 views widely different from the other Devonic congeners; on the 

 abactinal side by the great mass of very small stellate plates which 

 give the very flexuous rays and disk a strangely granular aspect; 

 on the abactinal side by the wide ambulacral grooves filled with long, 

 narrow, striplike ambulacrals. The rays which originally were 

 probably higher than wide appear now too wide in several of the 

 specimens, the abactinal portion having been flattened out and 

 pressed over on both sides of the actinal sides. 



We also figure here the abactinal view of a young specimen (pi. 

 XIV, fig. 1). It shows a curiously intricate mass of star-shaped 

 and wedge-shaped ossicles apparently without any regular arrange- 

 ment. The. actinal view of another young specimen proves the 



