42 



The plates, in the regular interradial areas, are of almost uni- 

 form size. In the best preserved areas there is one plate in the 

 first range, two in the second, three in the third and four in the 

 fourth, but in one of the areas there are only three plates, in the 

 fourth range. The fourth range curves in toward the vault and 

 it would seem, therefore, to be the last range properly belonging 

 to the calyx. There is one plate in each intersecondary radial 

 area, which will necessarily give the vault a pentagonal outline, 

 notwithstanding its rounded appearance when we look at the in- 

 folded arms. The only plates preserved in the azygous area be- 

 long to the small column of hexagonal plates on one side of the 

 area. An examination of the primary radial plates and appear- 

 ance of the specimens lead to the conclusion that this area is de- 

 pressed and quite different from the other areas in all respects. 



This species is so different from all others that no comparison 

 with any of them is necessary to distinguish it, beside it is the 

 first time a species belonging to this genus has been described 

 from rocks of the age of the Kaskaskia Group. 



Found by Prof. A. G. Wetherby, in whose honor we have 

 named the species, ia the Kaskaskia Group, in Pulaski county, 

 Kentucky, and now in the collection of Wm. F. E. Gurley. 



emperocrinus, n. gen. 



[Ety. emperos, deformed; krinon, lily.] 



This genus is proposed to receive species that have three 

 basals, five subradials and regular interradials, but do not belong 

 to any of the described genera in the family Taxocrinidce. Basals 

 three, of unequal size. Subradials five, three heptagonal, two 

 hexagonal. Primary radials two in each ray. Kegular interra- 

 dials one or more in each area. Azygous plates two or more. 

 The radial system is altogether different from that belonging to 

 any other genus, in the family Taxocrinidae, but the whole struct- 

 ure is fundamentally different, in all other respects, from all 

 other families of crinoids and hence the genus is placed here, at 

 least, provisionally. Type Emperocrinus indianensis. 



