50 



ART. 2. — H. MATSUMOTO 



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13ores and somo ten basal tentacle pores open by means of tubes, 



a character which was over- 

 looked by Lyman. Colour in 

 alcohol, light pinkish brown, 

 or dark brownish purple, if 

 the specimens have not lain 

 in alcohol for a long time. 

 The dermal granules, which 

 are present in the arm bases 

 and the disk, are more con- 

 spicuous in smaller specimens. 

 I have failed to find any impor- 

 tant distinguishing characters 

 between A. sagaminum Döder- 

 LEiN and the young specimens 

 of corresponding size of the 

 present species, so that I consider tlie former as a synonym of 

 A. caudatum. 



In this species, the ribbon-shaped generative glands reach out 

 to an enormous extent. In a specimen with the disk diameter of 

 25 mm., they extend outwards about 180 mm. and as far as the 

 seventieth free arm joint. The parts of the arms containing the 

 generative glands are quadrangular in transverse section, covered 

 dorsally by a much wrinkled skin, and have, on the dorsal and 

 lateral sides of each joint, a row of plates supporting and protect- 

 ing the cavity in which the generative glands lie. These plates 

 are replaced by double rows of minute scales in tlie sterile parts 

 of the arms. In smaller specimens, the generative lobes are con- 

 fined to the short basal portion of the arms, winch is much 

 widened. Thus, specimens of about 12 mm. in the disk diameter ■ 



Pig. 13. Asteroschenid {Oj;/( to crews) cuudatum 

 x4. a. From above, h. From below. 



