4(5 K. MITSUKUIU : STUDIES ON 



Specimens examined : — 



Description : — Tentacles 20. Body cylindrieal, about a. foot 

 loni,% the ventral surface flat ; the dorsal, convex. Anterior ex- 

 tremity slightly attenuated. Feet less frequent on the dorsal than 

 on the ventral surface. The ventral surface ashy white, orna- 

 mented with grayish brown spots and rings around the base of 

 pedicel-^. Dark brown lines dividing the surface into small squares 

 most conspicuous on the sides. Dorsum coffee-brown, with 

 many irregtdar angular lighter spots. The region around the 

 anus as light colored as the ventral. The line dividing the 

 ventral coloration from the dorsal, irregular, broken, marked with 

 angles. Mouth slightly dorsal. Anus slightly inferior. 



The ventral pedicels in thrci' distinct rows in the young. 

 The i)a]iillac of thr dorsum extraordinarily long and longer than 

 in any holothurian (Sempee). Calcareous bodies small, X-sliaped, 

 branched as occurs often in the species of Stichopus and 

 MiiUevia, comparatively few in number. Polian vesicle and 

 stone- canal one each. ^V'ith or without Cuxierian organs. The 

 color of the dorsal surface is always well delined from that of 



