90 ART. 2. — H. MATSUMOTO : 



numerous, and the disk is less distinctly set off from the arms^ 

 In larger specimens, the disk tubercles are more numerous and 

 show a tendency to arrange themselves, though very irregularly, 

 in ten radiating rows, one on each radial rib. 



The present species is very near to A. murrayi Lyman, but 

 differs from it in the much narrower brachial lobes of the disk, 

 in the narrower interbrachial ventral surfaces, in the longer genital 

 slits, in the fewer and larger tubercles in the spaces just inside 

 the interbrachial ventral surfaces, in the much shorter arms and 

 in the slightly fewer arm spines. i 



Astroclon suensoni Mortensen. , 



Astroclon suensoni; Mortenben, Vidensk. Medd. Naturhist. Foren» 

 Kjobanhavn, LXTII, 1911, p. 209. 



Off Amakusa, Eastern Sea (Mortensen). 



Order ii. ljemophiurida Matsumoto. 



Disk covered by a soft skin, or with fine scales or plates» 

 very often beset with granules, spines or stumpy tubercles. Radial 

 shields sometimes rudimentary. The radial shield and genital 

 plate articulate with each other by means of a simple face or ä 

 transverse ridge on both the plates. Peristomial plates very large; 

 usually entire. Oral frames without weU developed lateral wings. 

 Arms entirely covered by the three kinds of arm plates, of which 

 the dorsal and ventral ones are usually very small, while the lateral 

 ones are very well developed, very often approximating dorsally 

 as well as ventrally. Vertebral articulation either zygospondyline 

 or streptospondyline. > 



This order is very near to the Phrynopliiurida, especially the 

 Ophiomi/xldœ, but differs fi-om them essentially in the entirely 



