NO. 1555. HAWAIIAN HOLOTHUniANS— FISHER. 691 



Genus PSEUDOSTICHOPUS Theel. 



FseudoMichopHS Theei,, C'hallen]Lrer Holothurioidea, Pt. 2, 1886, p. 169. Type, 

 Pseudostichopns mo/Us Tht-el. 



Tentacles 19 to 20; no tentacle ampulla?; madreporic canal attached 

 to body wall; ventral surface flattened (more or less); ambulacral 

 appendages in the form of unusuall}^ small, inconspicuous pedicels and 

 papillte which are more or less clearl}" arranged in longitudinal series; 

 gonad in two bundles (a right and a left); anus in a perpendicular 

 furrow, without teeth; perisome without calcareous deposits, except 

 in some species about anus; pedicels with terminal plates and deposits 

 in one species; deposits sometimes present in walls of genital tubes 

 and respiratory tree. 



PSEUDOSTICHOPUS PROPINQUUS, new species. 



Plate LXXI, figs. 3, 3a-h; Plate LXXII, figs. 2, 2a; Plate LXXIII, fig. 3; Plate 

 LXXIV, fig. 1; Plate LXXVI, figs. 3,Sa-b. 



Contour of body as viewed from above or below rather broadl}' 

 elliptical ; ventral surface slightly arched, dorsal surface decidedly so. 

 Mouth directed ventrall}, but terminal. Anus in a prominent ver- 

 tical furrow at extremit}' of body ; more ventral than dorsal. Anal 

 furrow, caused by the ))ody growing caudad on either side of anus, 

 forming two prominent mammillated processes. Tentacles 18 (to 20 ?) 

 with small circular peltate crowns; entirely retracted. Ambulacral 

 appendages for the most part very inconspicuous and small, in the 

 form of minute pedicels ( ^) and papilla? scattered along ambulacra; 

 those of either ventro-lateral ambulacrum most prominent on account 

 of a single irregular row of small mammiform tubercles extending 

 from caudal process forward, and connecting with series of opposite 

 side in front of mouth. In addition, minute, thread-like papilla? are 

 scattered on either side of these tubercles which are capped by very 

 slender pedicels or papill;*; and a very few are to be found in mid- 

 ventral region; papilla? of dorsal ambulacra very slender, long, and 

 threadlike; apparently not regularly arranged. Perisome devoid of 

 any calcareous deposits; no supporting rods or terminal plates in am- 

 bulacral appendages. Walls of gonad and respiratory trees contain 

 branched rods. Body wall transluc(>nt, rather thin except along either 

 edge, which is thickened by a subcutaneous jelly-like substance, form- 

 ing a sort of rim to the bod^^ More or less mud, sponge spicules, and 

 foraminifera cling to integument, especially on ventral surface. Color 

 in alcohol, translucent whitish. Length of largest specimen, about 

 50 mm. ; width, about 25 mm. 



Locality. — Station 3866, northeast approach to Pailolo Channel, 

 between Maui and Molokai islands, 283 to 281 fathoms, gray mud, tine 

 sand ; bottom temperature 43.8° ; 2 specimens. 



