138 



K. MITSUKUßl : STUDIES ON 



ventral pedicels of the large Osliima specimens above mentioned. 

 The South Negros specimen is 8 cm. long and 3.5 cm. broad. 

 It is much rougher to the touch than any specimen in the above 

 two sets. In coloring it much resembles tlie Oshima specimens. 

 The ventral pedicels have well-developed end -plates. The dorsal 

 papillae, at least some of them, also have well-developed end-plates. 

 The Liu-Kiu specimens all measure about 4.5 by 2 cm. The 

 skin, which is thin, is quite rough to the touch. Their color re- 

 sembles on the whole that of the Oshima specimens, but is some- 

 what darker on the dorsum and dirty wdiite on the ventrum. On 

 two of them there is a narrow median longitudinal groove — a 

 structure not distinct in any of the other specimens in their pres- 

 ent contracted state. The end-plates are found in both the ven- 

 tral and the dorsal ambulacral appendages. 



Tlie three specimens from Torres Strait (No. 1259) are re- 

 markable in that they arc almost black in color on the dorsum 



and on the ventrum have a tolerably 

 dark shade of yellowish brown. They 

 are like other specimens in every other 

 detail. 



Calcareous deposits are very abund- 

 ant, especially in the ventral peri- 

 some. They consist of tables outside, 

 and a bed of buttons inside. It will 

 be seen from the figures (textfig. 24 b, 

 c) that tlie tables in these specimens 

 have a rather solid irregularly quadri- 

 lateral disk with smootli margin. The 

 disk is frequently irregular and incomplete, in wliich case the 

 central opening is often eccentric in position. In complete disks 



Textfig. 24. 



Ilolothuria scabra : a — Calcareo i3 

 ring ; b, c— Tables of dorsum ; d 

 —Button of ventrum. (h—dxSOO). 

 I— Interraclialia ; R — Radialia. 



