no. 2073. EOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 237 

 Genus L^TMOGONE Theel. 



26. LiETMOGONE VIOLACEA Theel. 



Lsetmogone violacea Theel, Bihang til kongl. Sv. Vet. Akad. Handl., vol. 5, 1879, 

 p. 11; Challenger Holothurioidea, pt. 1, 1882, pp. 78-80, pi. 13, figs. 1-3; 

 pi. 36, figs. 20-24; pi. 42, fig. 2. — Perkier, Travailleur and Talisman Holo- 

 thurioidea, 1902, pp. 390-398, pi. 19, figs. 1-7.— Augustin, Japanische 

 Seewalzen, 1908, p. 21. — Mitsukuri, Actinopodous Holothurioidea, 1912, 

 pp. 192-198, pi. 6, figs. 52-54, text-fig. 36. 



Cryodora spongiosa Theel, Bihang til kongl. Sv. Vet. Akad. Handl., vol. 5, 1879, 

 p. 9. 



Lsetmogone spongiosa Theel, Challenge?* Holothurioidea, pt. 1, 1882, pp. 80-82, 

 pi. 14, figs. 1-3; pi. 39, figs. 5-6. 



Lsetmogone jourdaini Petit, Bull. Soc. Philomat., Paris, ser. 7, vol. 9, 1885, 

 pp. 9-11. 



Lsetmogone brongniarti E. Perrier, Les Explorations sousmarines, 1886, fig. 241. 



Station 4919. One specimen. 



Station 4957. One specimen. 



Station 4958. One specimen. 



Station 4960. One specimen. 



Station 5082. Two specimens. 



Station 5088. One specimen. 

 The specimens from Station 5082 are the largest ever recorded, 

 being 170 mm. long and 45 mm. in breadth. 



Habitat. — Off Sydney (Theel, 1879); Flores Sea and Moluccas 

 (Sluiter, 1901); Andaman Islands (Walsh, 1891); Maldives (Koehler 

 and Vaney, 1905) ; west Greenland (Mortensen, 1913) ; north of 

 Scotland (Theel, 1882); Bay of Biscay (Petit, 1885); from off 

 Gibraltar along the west coast of Morocco and Sahara to Senegal, 

 and Azores (Perrier, 1902); south of Totomi, Honshu (Theel, 1879); 

 Sagami Sea (Mitsukuri, 1912) ; off Koshiki Islands, west of Kyushu; 

 southwest of Shikoku. 



27. L^TMOGONE PARVA Mitsukuri. 



Lxtmogone parva Mitsukuri, Actinopodous Holothurioidea, 1912, pp. 186-188, 

 pi. 5, figs. 46-47, text-fig. 34. 



Station 4956. One specimen. 

 The specimen is much larger than the original ones, measuring 

 68 mm. in length, 12 mm. in width, and 10 mm. in height. Integu- 

 ment is thick and gelatinous, of a gray color all over. At bases of 

 tentacles and papillae deep purple patches are to be seen. Tentacles 

 15, nonretractile. Papillae retracted, about 20 in a row along the 

 median side of each dorsal ambulacrum. Pedicels also retractile, 

 quite minute, probably about 30 in each row along lateral margin 

 of ventrum. Unlike the original specimens, the present one con- 

 tains small, wheel-like plates scattered all over the dorsal perisome. 

 They are precisely the same as those described by Mitsukuri, with a 

 mean diameter of 76//, and varying between 60-117//. Peripheral 

 holes are almost constantly 10 in number, but may in exceptional 



