till! vault, and the liexagoiial seeijud primary radials an; due 

 rather to the number of interradials than to the usual length- 

 ening of the calyx, which induce us to refer the species to 

 Bnlocrinus. 



The basal plates form a thin hexagonal disc with slight re- 

 entering angles. The disc is only gently concave for the at- 

 tachment of the column, and the columnar canal is quite large. 

 Each basal plate bears two nodes or short spines that are 

 directed downward. First radial large, wider than long, three 

 licxagonal. two heptagonal, and each one is produci'd in th<' 

 form oi a wedge-shaped spini'. The second primary radial^-, 

 differ .somewhat in size, abont one half wider than long, hex 

 agonal, by reason of a .slight truncation of the .superi(jr angles 

 hy the interradials. and each one bears a central node. Third 

 primary radials smaller than the second, pentagonal, axillary, 

 i-ach bears a central node and supports upon each upper slop 

 ing side a single .secondary radial, which is axillary and sup- 

 ports, in four of the rays, ujion each upper sloping side, a 

 single tertiary radial, which gives to each of these rays four 

 arms. In one of the lateral rays, the third primary radial 

 supports, upon one side, an elongated .secoudary radial, with a 

 deeply concave facet for the i-eception of the first arm plate, 

 and upon the other an axillary secondary i-adial, which sup- 

 ports upon each upjiei' side a single tertiary j'adial, which ai'- 

 rangement gives ti> this I'ay three arms. There are, there 

 fore, nineteen arni.s in this species. 



In OU'' of the regular interradial areas there are five plates, 

 one in the first I'ange, two in the .second range, and two in 

 the third range. In each of the other three regular interradial 

 areas there are four plates, one in the first range, two in the 

 second range, and one in the third i-ange. In the azygous area 

 Ihtire are seven plates, the tirst one is in line with tiie ftrst 

 primary radials and fully as large and spinous as either of 

 them. It is followed by two large spinous plates in the sec- 

 ond range, three smaller plates in the third range, and one 

 .snuill depressed plate in the fouith range, that sends an angh' 

 high between the tertiary radial.-, and j-eaches an angle, in a 

 plate, that connects with the vault plates above the summit of 



