AfTIXOrODOrS nOLOTHrRTOIDEA. 137 



with numerous fine dark points and a median longitudinal groove. 

 Anus star-shaped. .Skin I'ough. Size up to 28 cm. Polian vesicle 

 one. Stone-canal one, vei-y large, \ — ^ the length oC the body, 

 consisting of several moandei'ing hollow stripes. Cuvierian oi'gan 

 i)i the shape of blind guts, often very numerous (up to 100). 

 Tentacular ampul l;i3 long. 



Remarks : — The four large specimens from Oshima measure in 

 the present contracted state 12 — 13 cm. in length and 7 — 8 cm. 

 in breadth ; but as their skin is very thick, it is quite conceiv- 

 able that in the fresh state they would easily attain a 

 length of 30 cm. or more. Their color on the back is dark-grey 

 with a tinge of green, being darkest along the middle of the 

 back. From this, it becomes gradually ashen-grey at the sides 

 and passes into white on the ventral surface. All over the body 

 are scattered dark points which mark the positions of ambulacral 

 appendages. These show themselves very conspicuously on the 

 ventral surface as black spots on the white ground, and are most 

 numerous along the three ambulacral lines. On one of the speci- 

 mens they arc each marked with a small white ring showing 

 best on the dark gi'ound of the dorsum and the sides. The skin 

 is rathei' smooth and hardly deserves the name scahra. Ambula- 

 ci'al a])pen(lages an- all small. Dorsal papilhe are unfortunately 

 all much contracted : so far as I have examined, I have not been 

 able to make out an end-plate in any of them. Even on the ventral 

 pedicels this is very weakly developed. 



The Guam specimen is 1 1 cm. long and 5.5 cm. broad. The 

 color is decidedly dark-bi-own on the dorsum and greenish wliite 

 on the vcntrum. In (his specimen I was able to recognize end- 

 plates in botli the dorsal pajiilLf and the ventral ]X)dicels. Those 

 in the latter arc decidedly more strongly developed than those in the 



