ON A COLLECTION OP OPHIURANS FROM KINK. WAS AN . 477 



interbrachial ventral surface, small and rather insignificant. Oral angles 

 constricted off from the outer parts by a shallow groove, covered by a 

 pavement of coarse, polygonal or rounded grains. The grains near the 

 apices of the oral angles show a tendency to be papilla-like. Dental 

 papillae and teeth alike, spiniform, acute. Oral papillae absent. Second 

 oral tentacle pores visible from below, situated on either side of the 

 outer end of the oral slit, opening by means of a short cutaneous tube, 

 which contains very fine granules. 



Arms stout at the base, gradually tapered outwards. Dorsal and 

 lateral surface annulated with double rows of granules, which bear 

 minute compound hooks. Interannuli covered with coarse, polygonal or 

 rounded, more or less flattened grains, which are arranged irregularly 

 in two, or sometimes three, transverse rows. The hook-bearing annuii 

 of one or two first free arm joints interrupted at the dorsal median 

 parts by coarse, polygonal or rounded, flattened grains similar to those 

 of the interannuli. At the lower lateral end of each interannulus, 

 there is a large, rounded plate, which also bears minute hooks. Ven- 

 tral surface of arm covered with a pavement of coarse, polygonal or 

 rounded, flattened grains, which are coarser within the disk and finer 

 outwards. First brachial tentacle pores without any naked lateral 

 arm plate and arm spine. Those beyond protected by a small, convex, 

 ridge-like, naked lateral arm plate and by two, or sometimes three, 

 peg-like arm spines with thorny tips. The adradial spine is longer and 

 stouter than the abradial, and slightly longer than, or about as long 

 as, half the corresponding arm joint. The abradial one is shorter than 

 half the same. 



Colour in alcohol, light brown or whitish. 



This new species is evidently near to both Astrothrombns rugosus 

 Clark 15 from New South Wales and Astrothorax misakiensis DöDER- 

 LEIN from the Sagami Sea. The former is stated to have the disk 

 plates and radial shields of very irregular size and two or three arm 



1) Mem. Austr. Mus., IV, 1909, p 548. 



