NO. 1555. HA WAIIAN HOLOTHURTANS— FISHER. 707 



Localities.— Ty^Q (Cat. No. 21221, U.S.N. M.) from Station 4141, 

 vicinity of Kauai Island, 437 to 632 fathoms, volcanic sand, foraminif- 

 era; bottom temperature, 41^. Station 3988, vicinity of Kauai, 469 to 

 165 fathoms, gray foraminiferous sand, pebbles. 



All but six of the tentacles have been rubbed otf, so that it is impos- 

 sible to give the exact number, which appears, however, to be in the 

 neighborhood of fifteen. This species is especially characterized by 

 the numerous pedicels which form a crowded series along either 

 ventro-lateral radius. These pedicels are nmch slenderer than those of 

 Ldetmogone loyville-thortuson!^ or of any other figured species, and are 

 not spaced, the bases touching. They are largest in anterior two- 

 thirds of body and decrease slightly in length toward the posterior 

 extremity. Each pedicel has a flat, sole-like sucking disk about 1 to 

 1.5 mm. in diameter. Breadth of ventral surface between the two 

 series of pedicels is 16 mm. Papillae are decidedly small for genus, 

 and their arrangement in two series on each dorsal radius is unusual 

 for this group. 



Calcareous ring is not divided into separate pieces, but forms a con- 

 tinuous ring as in Z. wyvUle-thovisoni. It is thicker and heavier than 

 in that species, and the radial portions present deep cup-shaped depres- 

 sions on the antei'ior face. Polian vesicle single, 13 mm. long. Mad- 

 reporic canal relatively shorter than in wyv'dle- t/iomsoni (about 5 mm.), 

 passing upward and backward to open near the middorsal line 18 mm. 

 from anterior extremity of body. The canal on piercing the body 

 wall divides into seven, or probably even more, minute canals, but 

 inasmuch as the external perisome has been completely rubbed off it is 

 impossible to tell whether each of these tubules ends in a papilla as in 

 wyville-thotnso/u' . Gonad forms a large tuft on right and left sides of 

 mesenter}- tubules branched. The gonoduct opens to the exterior 

 right beside the madreporic canal, but the papilla has been rubbed off". 

 No spicules in walls of gonad or of alimentary canal. 



The wheels of ventral perisome are rather scattered and are more 

 numerous than the rods. Diameter varies from 0.054 to 0.065 mm., 

 the wheels being thus all small and not greatly different in size. Gen- 

 erally there are twelve spokes, but occasionally thirteen or fourteen. 

 The rim is on a different plane from center; in other words, the wheel 

 is shaped like a shallow saucer, the edge being nearest surface of peri- 

 some. The large nave is quite constantly pierced by four holes, one 

 pair being always larger than the other. The rods separating these 

 holes form a convexity similar to that of the larger wheels (Plate XIII, 

 fig. la). Rods vary in length from 0.12 to 0.3 nmi. ; their form is 

 shown by figures. Owing to the fact that the outer perisome has been 

 scraped off the back, except on the papilhv and on their immediate 

 vicinity, it is not possible to give relative abundance of large and small 

 wheels between the rows of papillae. Papillae are crowded with small 



