JAPANESE ASTEEOIDEA. 463 



comparatively inconspicuous. It is covered with irregular, dis- 

 continuous furrows, which do not show any definite arrangement. 



Terminal plate. — The terminal plate is small and circular or 

 elliptical in outline, and is covered with granules exactly similar 

 to those of the superomarginals. 



Localiti/. — Koniya in Amami-Oshima, Linschoten Islands. 



Tlie colour of the dried specimen is dirty brown. 



Specimen in S.C. 



This species is nearly allied to 0. rouxl Kœhlee recently 

 described from the Moluccas [Kœhlee. :11, p. 272]. 



Oreaster naJiensis^ n. sp. 

 (PI. XVI, figs. 241-243.) 



This species appears to be closely related to 0. chinensii^, 0. 

 deciplens and especially to 0. reinhardtl, and combines some of 

 the characters of 0. nodosus and 0. modestus. It is distinçruished 

 from nodosum by a lesser development of the abactinal tubercles, 

 the relatively larger size of the ventrolateral plates and the num- 

 ber of spines of the adambulacral armature, and from modestus 

 by a greater elevation of the abactinal side, the presence of 

 only one form of pedicollarias on tlie abactinal side and the 

 relatively smaller size of the ventrolateral plates. From 0. rein- 

 hardtl it is distinguished by the notably greater development 

 of the abactinal tubercles, the total absence of tubercular 

 marginal plates, the presence of at least two series of lateral 

 longitudinal ossicles on the sides of the arms as seen from the 

 surface, the w^eaker development of the trabeculae that connect the 

 adcental tubercles, and the presence of two accessory small tuber- 

 cles on the outer side of each adcentral tubercle. 



