THE SYXAPTID/E OF JAPAN. 



475 



been flat. Length, as measured on the two fragments put together, 

 120 mm. ; diameter 9 mm. Each of the twelve tentacles bears five 

 pairs of digits. Polian vesicles five. 



The specimen agrees very well in characters with those from 

 Hawaii as described by Fisher. 



13. Chiridota discolor Eschscholtz. 



Chiridota discolor Eschscholtz, Zoologischer Atlas, 1829, pp. 12- 

 13; pl. X, fig. 2. — Clark, The Apodous Holothurians, 1907, pp. 26-28, 

 120. — Ohshima, Albatross Holothurians (m.s.). 



Besides several stations in Alaska, Aleutian Islands and Bering 

 Islands, the present species has also been reported from Okhotsk Sea 

 (Grube) and from Robben Island (Clark). 



14. Chiridota albatrossii Edwards. 



Chiridota albatrossii Edwards, Albatross Holothurians, 1907, pp. 

 50-52 ; textfigs. I a-c, 2 d-f, 3. — Ohshima, Albatross Holothurians 

 (m.s.). 



Within the limits of the Japanese Empire, the species was ob- 

 tained from the " Albatross " stations off the coasts of Southern 

 Saghalien and of Hokkaido. 



15. Polycheira rufescens (Brandt). 



Chirodota rufescens Brandt, Prodr. descr. anim. ab H. Mertensis 

 obs., 1835, p. 59. 



Chiridota variabilis Semper, Holothurien, i867-'68, p. 20 ; pl. V, 

 figs. 6, 7, 9, 11, 19; pl. VI, fig. II. — Augustin, Japanische Seewalzen, 

 1908, p. 39. 



Polycheira rufescens Clark, The Apodous Holothurians, 1907, pp. 

 120-121 ; pl. VII, figs. 14-18. — Ohshima, Synaptiden von Misaki, 1913, 

 pp. 258-259; pl. VI, fig. 9. 



The species has been known from Bonin Islands (Brandt) and 



