JAPANESE ASTEEOroEA. 45 



Cheiraster yodomiensiSf n. sp. 



(PI. I, figs. 1—7.) 



I have only one dried specimen of this new species, which 

 however is in excellent condition. The measurements are as 

 follows : 



The disk is comparatively large, considering the slenderness 

 of the arms ; the interbrachial angle is very nearly a right angle. 

 The actinal side is plane, and the long spines of the adambulacral 

 and inferomarginal plates are very conspicuous. The abactinal 

 side of the arms is for the most part perfectly plane, but that of 

 the disk and the basal parts of the arms is slightly concave in 

 the dried specimen, and must have been somewhat inflated in life. 

 There is also, in my specimen, a circular depressed area of an 

 orange red colour in the centre of the disk, in which the anus is 

 situated. The paxillœ with large central spines extend into the 

 arms about as far as the fifth or sixth superomarginals, beyond 

 which the spines are considerably smaller and form small groups 

 of two or three arranged in a row on either side of the arm. The 

 spines near the outskirts of the spinous area are also smaller than 

 those nearer the centre. The spines of the marginals are very 

 long and conspicuous. 



Superomarginals.— n\Q first superomarginal is nearly twice as 

 high as bread, and is more prominent than the others, on the 

 abactinal side. It carries a single long, slender, conical, pointed 

 spine which may be as long as 14 mm., and one or two very 

 much smaller spines near the base of the former, usually on the 



