116 K. MITSÜKUEI : STUDIES ON 



pedicels into three zones if the median line is absent, or into four 

 zones if this is present. In the latter ease, each zone consists 

 of about four rows of pedicels ; in the former case, the; 

 median zone of pedicels is the broadest of the three, having 

 7 — 10 pedicels across. In certain specimens the pedicels are 

 apparently scattered ah over the ventrum without any of the 

 clear lines just mentioned. It is more than probable that the 

 division of the pedicels into zones by the clear lines is most 

 conspicuous in the younger specimens. 



Color of ventrum always lighter tlian that of dorsum, — 

 either almost white or tino;ed with a light straw yellow. The 

 bases of pedicels are surrounded by a dark brown, the basal 

 parts of each pedicel being also similarly colored. Beyond this, 

 the tip of the pedicel is yellow. The ground color of the dorsum 

 is generally a very light brown. There is a difference in shade 

 in different individuals, those from the deeper waters seeming to 

 be generally darker. In one specimen, there was a slight greenish 

 yellow tinge to the ground color. Numerous dark brown spots 

 mark the bases of dorsal papilla?. Although these spots are 

 generally scattered without any order, those on the line, or just 

 outside the line, of the inner series of tubercles on each dorsal 

 radius are often arranged more or less in a longitudinal line ; and 

 furthermore as the outer aspect generally, or sometimes all of 

 the adjacent large tubercles, are colored with more or less con- 

 spicuous large brown patches, this line stands out prominently ; 

 and wdien the general view of the animal is taken from a distance^ 

 it looks like a streak of dark brown on each side of the body. 

 This effect is heightened in most specimens by the presence, just 

 outside the line, of a more or less clear longitudinal streak wdiich 

 is devoid of brown spots (this streak corresponds to the line of the 



