7 



the vault, and the hexagonal second primary radials are due 

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

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

 Batocrinus. 



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 

 hexagonal, two heptagonal, and each one is produced in the 

 form of a wedge-shaped spine. The second primary radials, 

 differ somewhat in size, about one-half wider than long, hex 

 agonal, by reason of a slight truncation of the superior angles 

 by the interradials, and each one bears a central node. Third 

 primary radials smaller than the second, pentagonal, axillary, 

 each 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, upon 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 secondary radial, with a 

 deeply concave facet for the reception of the first arm plate, 

 and upon the other an axillary secondary radial, which sup- 

 ports upon each upper side a single tertiary radial, which ar- 

 rangement gives to this ray three arms. There are, there- 

 fore, nineteen arms in this species. 



In ono of the regular inter radial areas there are live plates, 

 one in the first range, 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 range. In the azygous area 

 there are seven plates, the first one is in line with the first 

 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 

 small depressed plate in the fourth range, that sends an angle 

 high between the tertiary radials and reaches an angle, in a 

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



