85 



light spot on each radial shield ; arms indistinctly banded with darker 

 and lighter blue ; along the middle a fine white line, bordered on 

 each side with a band of blue ; below, disc pale blue, arms mottled 

 and speckled with dark and light blue ; arm-spines transparent, 

 nearly white ; the points of the larger ones brownish. 



Ophiolh-lx Cheney i stands near O. longipeda, but has arms only 

 about half as long. It is distinguished by its large size and its broad 

 flat arms, bearing regular and well-marked upper arm-plates. 

 Zanzibar. 



AsTROPHYTON CLAVATUM, Lyman. 

 Special marks. Radial ribs closely beset with minute, thorny 

 stumps, or spines. 



Description of a specimen. Diameter of disc 30 millim. "Width of 

 arm at first fork, 12 millim. Length of arm, 231 millim. 



1st joint (within the disc) to 2d . . 8 millim. 



