152 K. MITSUKURI : STUDIES ON 



pillse. They are largest and most developed in the middle 

 part of the body, but become simpler toward the two ex- 

 tremities, and at the very front and posterior ends, are represent- 

 ed by large conical simple papillae. The space between composite 

 papillöß has many wart-like simple papilloe, which are 2 — 3 mm. 

 across. The whole ventrum is closely beset with large pedicels, 

 without any arrangement in rows. Kent gives a good photograph 

 of the animal (PI. XXXV., fig. B, named Stichopus variegatus by 

 mistake) ; only in my specimens, the large compound papillae are a 

 little closer. 



The ground color of the dorsum can best be likened to that 

 of a ripe tomato, being of a peculiar yellowish red color. When 

 kept in a vessel for some time, the yellowish tinge comes to pre- 

 dominate. In the space between large compound papillae, there 

 are many brown spots which correspond to wart-like simple 

 papillae. All over the dorsum, on the compound papillae as 

 well as in the interspace, there are numerous minute spots, 

 yellow when living, and whitish in alcohol. They enclose 

 each a minute opening and probably correspond to minute 

 papillae. Between warts, there are seen some irregular blackish- 

 brown streaks which are especially prominent on the side of 

 the body and can be seen best in life. The color and 

 papillae of the dorsum have been recently figured by Sluiter 

 (19015.). The color of the ventrum has a much more 

 reddish tinge than that of the dorsum. The tentacle is 

 yellow. 



There are two kinds of calcareous deposits : ( i ) Slender X- 

 shaped spicules whose ends divide dichotomously once or twice 

 and are produced into long, fine tapering points (textfig. 25c). 

 (ü) Innumerable minute grains (/>), which, collected into aggrega- 



