no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 235 



more distally it is soft and slender. Deposits in perisome are in the 

 form of rods with both ends dilated and perforated, or rarely forked. 

 Those of ventrum are robust, have more holes, and are more numerous 

 than those of dorsum. Their length varies between 0.5 and 1 .45 mm., 

 often measuring 0.15 mm. across at the middle. In the posterior 

 region they are more robust and short and very numerous. The rods 

 of dorsum are slender, with a few terminal holes, length 0.4-1.25 mm., 

 and even at the base of papillae they are not of considerable length. 

 These rods form groups of a few each, with their ends collected in a 

 point. Very rarely some modified X-shaped rods are to be found in 

 dorsum. The arms are not straight as in those of Scotodeima setig- 

 erum Ludwig, but always slightly curved. Diameter 240-430 a as 

 measured diagonally. Tentacles and pedicels are supported with 

 larger straight rods and smaller bent ones, the former being 0.4-1.15 

 mm. long, and the latter only 0.2-0.6 mm.; end-plate is wanting. 

 Supporting rods of papillae are all straight; larger ones, 0.8-1.1 mm. 

 long, gathered together in conical groups at base ; smaller ones 0.25- 

 0.6 mm. long, occurring sparsely in filamentous part. In genital 

 tubes irregular branched rods, about 200 jj. long, are sparsely present. 

 Calcareous ring rather weakly developed, of spongy texture. Polian 

 vesicle and stone-canal single. Genital tubes about five on each side 

 of dorsal mesentery. 



There are four species very much resembling the present species, 

 all known by only one or two specimens each. These are Scotodeima 

 setigerum Ludwig, S. protectum Sluiter, S. vitreum Fisher, and Orph- 

 nurgus invalidus Koehler and Vaney. In the character of the deposits 

 the present species stands between 0. invalidus and S. vitreum, having 

 several X-shaped bodies in dorsum. The presence or absence of a 

 few small pedicels in the odd ambulacrum seems to be an unsafe guide 

 in distinguishing genera, for Fisher has clearly shown the presence of 

 26 very small pedicels along that ambulacrum in 0. insignis. It seems 

 therefore likely to me that the genus Scotodeima should be merged 

 into OrpTinurgus. 



Habitat. — Southwest of Shikoku; south of Totomi, Honshu. 



Type.— CM. No. 34154, U.S.N.M. 



Genus PANNYCHIA Theel. 



24. PANNYCHIA MOSELEYI ThSel. 



Pannychia moseleyi Theel, Challenger Holothurioidea, pt. 1, 1882, pp. 88-90, pi. 



17, figs. 1, 2; pi. 32, figs. 1-13. — Mitsukuri, Actinopodous Holothurioidea, 



1912, pp. 207-212. 

 Pannychia moseleyi, var. henrici Ludwig, Albatross Holothurioidea, 1894, pp. 95- 



99, pi. 10, figs. 1, 2. 



Station 5085. One specimen. 

 Habitat— Off Sydney and northwest of New Zealand (Th6el, 1S82) ; 

 Moluccas (Sluiter, 1901); near Cocos Island (Ludwig, 1894); Lower 



