234 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



much larger size of dorsal scales, the slenderness and length of papillae, 

 and the number of tentacles seem to be peculiar to the new species. 



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



Type.— Cat. No. 34153, U.S.N.M. 



Genus ORPHNURGUS Theel. 



22. ORPHNURGUS INSIGNIS Fisher. 



Orphnurgus insignis Fisher, Hawaiian Holothurians, 1907, pp. 702-706, pi. 73, 

 fig. 1; pi. 77, figs. 1, la-e, 2, 2a-c, 3, 3a-e. 



Station 4957. One specimen. 



Station 4958. Ten specimens. 



Station 4960. One specimen. 

 The largest in the collection measures only 85 mm. in length, being 

 much smaller than those from Hawaii. Fisher found the dorsal 

 papillae to be "arranged in a fairly regular linear series along each of 

 the two dorsal radii/' except in two specimens with "a double row." 

 But in the Japanese specimens the presence of double rows seems to be 

 constant, as may be seen from an examination of the ampullae from 

 inside the body wail. The inner (median) row consists of 15-27 

 papillae of various sizes, while the outer (lateral) is composed of a very 

 variable number of much smaller ones. In the largest specimen I 

 could find 15 and 17 papillae in the outer rows, while in smaller ones 

 there were only 5-10, or even none, apparently. Besides the charac- 

 teristic deposits as fully described and figured by Fisher, I find minute, 

 complicated bodies in longitudinal muscles. These are sometimes 

 rodlike, sometimes four-armed, and bear many branches on the ends 

 and processes along the sides. The length varies 60-200/z. 

 Habitat. — Hawaii (Fisher, 1907); southwest of Shikoku. 



23. ORPHNURGUS RIGIDUS, new species. 



Station 4957. One specimen. 



Station 4958. Two specimens. 



Station 4959. Two specimens. 



Station 5082. One specimen. 

 Body only 43 mm. long, of almost uniform breadth throughout, 

 namely, 8 mm. Mouth ventral, with 20 nonretractile tentacles; 

 anus terminal. Color grayish-white, tentacles fight brown. Integu- 

 ment thin and stiff, armed with large rods, visible with naked eye. 

 Pedicels nonretractile, 9 mm. long, 16-25, forming together a row 

 along each side of ventrum. Very often, smaller ones alternate with 

 the larger on the median side, so that a zigzag row is formed. The 

 odd ventral ambulacrum is utterly devoid of pedicels. Above the 

 lateral pedicels is a row of 13-17 flank papillae on each side of body. 

 Along each of the dorsal ambulacra papillae are arranged in a double 

 row, the inner consisting of 12-29, the outer of 6-17; a papilla may 

 attain the length of 15 mm., and its base is conical and stiff, while 



