no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 249 



between which various intermediate forms are to be found. One sort 

 is similar in shape to those found in the foregoing stage, and generally 

 lie in a deeper part. The other is of the same form as those found in 

 larger specimens, and these are more numerous than the large round 

 tables. In specimens of a still more advanced stage, about 130-150 

 mm. long, the round tables are very rarely found between those of 

 another form. In full-grown specimens there is only one kind of 

 table, the second sort, with small serrated, disk and plump spire, as 

 figured by previous authors (Augustin, text-figs. 5, 8; Mitsukuri, text- 

 figs. 315, c). The margin of the disks varies in the degree of its serra- 

 tion in different individuals (compare with S. depressus). In rare 

 cases the spire is totally absent, the deposit thus becoming a mere 

 perforated plate. Diameter of disks of these tables varies 46-106//, 

 height of spire, 40-60/*. 



Habitat. — Numerous stations in Sagami Sea (Augustin, 1908; Mit- 

 sukuri, 1912); Ibaraki Prefecture; Aomori Prefecture; Provinces 

 Noto and Ettchu (Mitsukuri, 1912); Kagoshima Bay; off Ojika 

 Peninsula. 



Family MOLPADIID^ J. Muller. 



Genus MOLPADIA Cuvier. 

 42. MOLPADIA RORETZII (v. Marenzeller). 



Haplodactyla roretzii v. Marenzeller, Denkschr. d. k. Akad. d. Wiss., vol. 35, 



1877, p. 387, pi. 4, fig. 1. 

 Arikyroderma roretzii v. Marenzeller, Neue Holothurien von Japan und China, 



1881, pp. 124-126, pi. 4, fig. 4. — Mitsukuri, Actinopodous Holothurioidea, 



1912, pp. 267-275, pi. 8, fig. 78, text-fig. 55. 

 Arikyroderma simile Theel, Challenger Holothurioidea, pt. 2, 1886, pp. 40-41, 



pi. 2, fig. 5; pi. 11, fig. 2. 

 Molpadia similis Clark, The Apodous Holothurians, 1907, p. 163, pi. 10, fig. 16. 

 Molpadia roretzii Clark, The Apodous Holothurians, 1907, p. 164. 



Station 4832. One specimen. 



Station 4945. One specimen. 



Station 5055. One specimen. 



Station 5059. Twelve specimens. 



Station 5067. Two specimens. 



Station 5069. Two specimens. 



Station 5092. One specimen. 

 The largest specimen measures 120 mm. in length, inclusive of the 

 caudal appendage, which is 17 mm. long. Racket-shaped calcareous 

 bodies in rosette-shaped groups of about 5 each, but varying from 3 to 

 7 ; mean length 485//, varying between 320 and 740/z. Anchors meas- 

 uring 260-495/* in length, with a mean of 370//; span of the arms 110- 

 180/./, with a mean of 140//; and the base 70-80// in diameter. Scat- 

 tered tables with from 1 to 9 holes, usually 4, in their small disks. 

 Diameter of disks 46-270//, averaging 120//. Spire is 70-130//, with 



