238 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



cases increase to 11 or 12. The wheels in papillae are smaller than 

 those of perisome, measuring about 45/i. Pedicels contain numerous, 

 well developed, bent, spinose rods and an end-plate. Ventral peri- 

 some is totally devoid of deposits. Genital tubes have also no 

 deposits, each branched once or twice dichotomously near its base, 

 and forming two tufts. Calcareous ring absent, represented by a 

 connective tissue. Polian vesicle single and small. Other charac- 

 ters agree well with the original specimens. 



Though differing in the number of papillse and in distribution of 

 deposits there is scarcely any doubt that the specimen belongs to 

 the present species. The differences may be due to the age of the 

 animal. 



Habitat. — Several stations in Uraga Channel (Mitsukuri, 1912); 

 southwest of Shikoku. 



28. LiETMOGONE SELENKAI Mitsukuri. 



Lxtmogone selenkai Mitsukuri, Actinopodous Holothurioidea, 1912, pp. 189-192, 

 pi. 5, figs. 48-51, text-fig. 35. 



Station 4903. One specimen. 

 Station 4904. Six specimens. 



The largest specimen is only 40 mm. long. The specimens differ 

 from the original (first) in the size of the dorsal papillae, which meas- 

 ure only 0.5-0.7 mm. in length and are much smaller than pedicels, 

 which measure 3-4 mm. in length, and (secondly) in the size of the 

 large wheels, which measure 80-280/z in diameter, thus attaining 

 more than twice the size given for the original specimens. It may 

 also be noticed that small wheellike plates are richly developed in 

 radial muscles, and that delicate branching rods 180-320// long are 

 present in genital tubes. 



L. neglecta Mitsukuri much resembles the present species, but 

 differs in the number of spokes in the large wheels and in having 

 rods in vent rum. 



Habitat. — Uraga Channel (Mitsukuri, 1912); off Goto Islands, west 

 of Kyushu. 



Genus ILYOD^MON Theel. 



29. ILYODiEMON IJIMAI Mitsukuri. 



Ilyodxmon ijimai Mitsukuri, Annot. Zool. Japon., vol. 1, pt. 4, 1897, pp. 133- 

 135; Actinopodous Holothurioidea, 1912, pp. 200-207, pi. 6, fig. 55, text-fig. 37. 



Benthogone quatrolineata Augustin (not Perrier), Japanische Seewalzen, 1908, 

 pp. 21-23, fig. 15. 



Station 4968. One specimen. 

 Station 5088. Fifteen specimens. 

 Station 5090. One specimen. 

 Station 5092. Two specimens. 

 The largest specimen measures 105 mm. in length and about 30 mm. 

 in breadth. Of the 4 rows of dorsal papillae the inner (median) series 



