48 



ART. 2. — H. MATSUMOTO 



W-'É^^^^:"^ 



angles not markedly set off from the outer parts. Six or seven teeth 



arranged in a. single vertical 

 row, very stout. On either 

 side of the oral angles, 

 there occm- several coarse, 

 flat, smooth, pavement-liko 

 grains corresponding to the 

 oral papillœ. 



Arms very stout for 

 the first three or four free 

 joints, but becoming rather 

 slender further out ; their 

 width just outside the 

 fourth free joint is 2.5 mm. 

 They constantly taper 

 outwards, so that they are 

 exceedingly slender to- 

 wards the extremities, and acute at the tips. Dorsal and lateral 

 surface of the arms covered by a skin, which is similar to that 

 of the disk and contains very fine, smooth, close-set granules, of 

 which there are about five in 1 mm. on the dorsal surface of the 

 arm bases. The granules become much finer outwards, and almost 

 disappear nearer the extremity of the arm. The vertebra} are 

 visible through the skin, but the surface of the arms is practically 

 smooth and without distinct demarcations of the joints, except in 

 the first three or four free joints, which are marked off by shallow 

 constrictions. The ventral surface of the arms is entirely naked, 

 and the lateral and ventral arm plates are clearly visible through 

 the skin. First tentacle ]Jore without arm spines ; next four or 

 five with one, and the rest with two spines. The abradial spine 



'CM 



Fig. 12. Asteroschema hemigymnmn. xG. a. From 

 above, h. From below. 



