MONOGKAPH OP JAPANESE OPHIUROIDEA. 47 



spines ; next four or five with one, and the rest with two spines. 

 The abraclial spine is very small, conical, enclosed in skin, with 

 rough end. The adradial one is small and conical in the basal 

 joints, distally longer and somewhat clnb-shaped, and slightly 

 longer than the. arm joint itself ; enclosed in skin, rough ; the 

 minute thorns at the end of the spine become distally rather 

 concentrated on the inner side of the spine, and finally, towards the 

 very extremity of the arms, the arm spines are transformed into 

 compound hooks, each with three or four booklets. Oral tentacles 

 enclosed in tubes. The first two or three tentacle pores are also 

 provided with tubes, though rudimentary. 



Colour in alcohol pale gray. 



This species is very near to A. salyx Lyman, but difiers 

 from it chiefly in the coarser granules of the disk and arm bases, 

 in the stout arm bases being as wide as high, in the much shorter 

 arm spines, and in the oral tentacles being enclosed in tubes. 



Astevoscherna hemigyinnuin Matsumoto. 



Asteroschema lieimgymnum : Matsumoto, Proc. Acad. Nat. Sei. Phila- 

 delphia, 1915, p. 53. 



One specimen ; off" Misaki, Sagami Sea. 



Diameter of disk 10 mm. Length of arms 120 nun. Width 

 of arms at base 3 mm. 



Disk rather flat, divided into ten lobes corresponding to the 

 radial ribs by ten radiating furrows, covered by a skin, which 

 contains very fine, smooth, close-set granules. Interbracliial ven- 

 tral surfaces rather vertical, narrow, forming a deep notch, on the 

 floor of which opens one madreporic pore. Genital slits rather 

 short, a little diverging dorsally. The ventral surface of the disk 

 is covered by a finely and rather sparsely granulated skin. Oral 



