226 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



canal with rather big madreporite not inserted to body-wall. Genital 

 tubes in two tufts; respiratory trees two, well developed. 



The present species is very closely related to B. patagiatus Fisher, 

 from which it however differs (1) in having fungiform papillae, (2) in 

 the absence of marginal brim, and (3) in having no C-shaped deposit 

 at all. The species also resembles B. ductus and B. roseus both 

 described by Koehler and Yaney. I take pleasure in naming this 

 species for Dr. A. Hjalmar Ostergren of the Zoologiska Station, 

 Kristineberg, Sweden, founder of the genus. 



Habitat. — Off Goto Islands, west of Kyushu. 



Type.— Cat, No. 34145, U.S.N.M. 



Genus MESOTHURIA Ludwig. 



9. MESOTHURIA MURRAYI (Theel). 



Holothuria murrayi Theel, Challenger Holothurioidea, pt. 2, 1886, pp. 185-186, 



pi. 10, figs. 16-18. 

 Holothuria murrayi (var. ?) Theel, Challenger Holothurioidea, pt, 2, 1886, pp. 



187-188, pi. 9, fig. 3. 

 Mesothuria mwrayi Osteegrex, Zur Kenntnis der Synallactinde, 1896, p. 351. — 



Slutter, Siboga Holothurien, 1901, p. 24. — Fisher, Hawaiian Holothurians, 



1907, pp. 683-685, pi. 71, figs. 1, la-h. 



Station 4903. One specimen. 

 Habitat— West of Chile (Theel, 1886); off the Strait of Gibraltar 

 (Theel, 1886); southeast of Flores, and Azores (Herouard, 1902); 

 Flores and Sulu Sea (Sluiter, 1901); Hawaii (Fisher, 1907); off Goto 

 Islands, west of Kyushu. 



10. MESOTHURIA PARVA (Theel). 



Holothuria murrayi, var. parva Tbeel, Challenger Holothurioidea, pt. 2, 1886, 

 pp. 186-187, pi. 9, fig. 2; pi. 16, figs. 4, 5. 



Mesothuria murrayi, var. parva Perrier, Travailleur and Talisman Holothurioidea, 

 1902, p. 316— Augustin, Japanische See^alzen, 1908, pp. 18-20, text-fig. 14. 



Mesothuria parva Fisher, Hawaiian Holothurians, 1907, pp. 686-687, pi. 71, 

 figs. 2, 2a-c. 



Mesothuria deani Mitsukuri, Actinopodous Holothurioidea, 1912, pp. 40-42, text- 

 fig. 9. 



Station 5092. Twenty-eight specimens. 

 Station 5094. Eighteen specimens. 

 From the excellent descriptions and figures given by Fisher it is 

 obvious that M. deani must be merged with this species. 



Habitat.— -Near Admiralty Island (Theel, 1886) ; Hawaii (Fisher, 

 1907) ; Misaki (Augustin, 1908) ; several stations in Sagami Sea, Uraga 

 Channel, and Osriima (Mitsukuri, 1912). 



11. MESOTHURIA MEDIA, new species. 

 Plate 8, figs. 4a, b. 



Station 4968. One specimen. 

 Body 30 mm. long, 7 mm. broad, mouth and anus terminal, ventrum 

 flat. Color grayish-white, ventrum a little lighter. Skin strongly 



