ACTINOrODOÜS HOLOTHURIOIDEA. 137 



with nnmerous fino dark points and a median longitudinal groove. 

 Anns star- shaped. Skin rough. Size up to 28 cm. Polian vesicle 

 one. Stone-canal one, very large, \—h the length of the body, 

 consisting of several meandering hollow stripes. Cuvierian organ 

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

 Tentacular ampuU^G long. 



Remarhs : — The four large specimens from Öshima measure in 

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

 in breadth ; but as their skin is very tliick, 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 are each marked with a small white rinrr showinc' 

 best on the dark ground of the dorsum and tlie sides. The skin 

 is rather smooth and hardly deserves the name scabra. Ambula- 

 cral appendages are all small. Dorsal papilla) 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-brown on the dorsum and greenish white 

 on the ventrum. In this specimen I was able to recognize end- 

 plates in both the dorsal papillœ and the ventral pedicels. Those 

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



