702 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



ORPHNURGUS INSIGNIS, new species. 

 Plate LXXin, fig. 1; Plate LXXVII, figs. 1, Irt-^^, 2, 2a-c, 3, 3a-e. 



In general form resembling Orphyiurgus asper Theel, but with dorsal 

 papillae arranged in a single series along each ambulacrum. Body 

 subcylindrical, slightly broader anteriorl}- than posteriorl}-^ ; ventral 

 surface flattened, dorsal well rounded. Mouth terminal, but turned 

 ventralward, large; anus terminal, large, somewhat dorsal. Tentacles, 

 17 to 20, rather long, nonretractile, with peltoid, divided crowns; 

 ventral tentacles apparently shorter than laterals. Along margin of 

 ventral surface 17 to 22, very large, slightly tapering, cjiindrical 

 pedicels with rounded tips, decreasing in length at posterior extremity. 

 Just above these a row of 12 to 18 long, rather slender, tapering 

 papilla?. Along each dorsal ambulacrum a single series of 12 to 36 long 

 papillfe, usuall}' unequal in size and somewhat smaller than the laterals; 

 the longest, longer than width of bod}- (in some specimens papillge are 

 comparatively short). Integument rather thin in fully expanded 

 specimens, that of ventral surface roughened by the deposits, partic- 

 ularly near posterior extremity. Deposits: In dorsal perisome nearly 

 straight smooth rods of widel}^ varying thickness expanded slightly 

 at tips, bearing several short branches once or twice dichotomously 

 divided, the larger rods usuall}' having a single perforation at either 

 end (Plate XII, fig. 1, 1*^/, />, c); also four-armed rods dichotomously 

 divided at tips, and rods intermediate between this and first variety 

 (Plate XII, fig. Ic?, e)\ in ventral perisome very much thicker and 

 heavier rods, dumb-bell shaped with longer and shorter spines which 

 are bifid to multifid at tips, scattered over the subspherical terminal 

 portions; also ver}^ many smaller rods with a few or no spines at blunt 

 tips. (Plate Xll, fig. 2, 2a, <?.) On posterior third of bod}^ these 

 dumb-bell shaped deposits are gradually transformed into irregular 

 ellipsoids spiny along one side and much larger and heavier than other 

 deposits. Ellipsoids are of various sizes and are ver^' crowded. 

 (Plate XII, fig. 3, 3«, 2>c.) In pedicels, stout, simple, or triradiate 

 rods more or less spiny at tips j(3J, ?/, d, e)\ in papillae simple slender 

 rods once or twice divided at tips (1 e). Color in life, yellowi-sh sal- 

 mon-color, pinker on body and yellower on pedicels and papillae. 

 Toward tips of pedicels are small spots of yellowish brown. Tentacles 

 yellow at tips. Length of largest specimen, about 160 mm. in con- 

 tracted state. 



Localities.— Tj^Q (Cat. No. 21220, U.S.N.M.) from Station 4134, 

 vicinit}^ of Kauai Island, 324 to 225 fathoms, fine coral sand, volcanic 

 sand; bottom temperature, 43.3°; 5 specimens. Taken also at follow- 

 ing stations, in all 118 specimens: 



