ACTINOPODOT'S HOLOTHURIOIDEA. 23 



make out details, bnt they probably present nothing exceptional. 



Calcareous deposits in the dorsal perisome (textOg. 4 c) very 

 much like those of the other species of SynaUactes. At the 

 base of dorsal papillae they are especially large. In the basal 

 part there also exist curved supporting rods with both ends per- 

 forated (f/). There are some very weakly developed terminal 

 plates. The ventral perisome has very characteristic calcareous 

 deposits. There is a lower, very thickly crowded layer of rods 

 {c,f), and scattered over these are discoidal triradiate tables (b). 

 In the ventral pedicels the rods and tables are of the same gen- 

 eral character as those of the ventral perisome. At the base 

 there are no specially large tables. There is numerically a some- 

 what larger proportion of the triradiate type in comparison with 

 the circular ones. End-plates well developed. 



Bcmarls : — The species is named for my friend Dr. Ishikawa, 

 Professor of Zoology in the College of Agriculture, Tokyo Impi-rial 

 University. 



6. Si/ i) nil act CS noxaivau sp i^- 



(Textfig. 5). 



Specimen oxamiued : — One alcoliolic specimen from Hokkaitlô. Nozawa 

 don. et coll. (Rci. Coll. Hpec. No. Um). 



Description : — The single specimen at my disposal differs in 

 several respects from S'. triradlata, and at the sanie time does not 

 agree with any known species, so that I have little hesitation in 

 making it a new" species. 



At present it is contracted, measuring cm. in length. The 

 color is pale with a violet tinge. In fresh state probably much 

 more violet. 



I can count IS tentacles in the specimen. Am1)ulacral ap- 



