244 
THE VOYAGE OF H.M.S. CHALLENGER. 
Station 89. — July 23, 1873 ; lat. 22° 18' N., long. 22° 2' W. ; depth, 2400 fathoms ; 
bottom temperature, 36°'6 ; Globigerina ooze. A single very deformed specimen. 
Length about 65 mm. Colour dark violet. Body probably with pedicels or rather 
papillse in a row round its sides. Deposits of a peculiar shape ; partly larger and 
smaller cruciform bodies (PL X. fig. 12), composed of four more or less strongly 
curved spinous arms and an outwardly directed central spinous process, partly more 
scattered, very strongly constructed, cruciform bodies with the curved arms slightly 
spinous and branched, and with a very long, straight, outwardly directed, central column, 
terminating in four hooks, like an anchor with four flukes. 
Station 298. — November 17, 1875; lat. 34° 7' N., long. 73° 56' E. ; depth, 
2225 fathoms; bottom temperature, 35° ’6 ; blue mud. One specimen. 
Station 299. — December 14, 1875 ; lat. 33° 31' S., long. 74° 43' W. ; depth, 
2160 fathoms; bottom temperature, 3 5° ‘2; blue mud. One specimen. 
The two forms, obtained from the above mentioned Stations, closely resemble 
Pseudostichopus villosus, but, in spite of the most careful examination, I cannot find 
any pedicels or processes, excepting some small elevations at the anus. Notwithstanding 
this, the radial ambulacral vessels seem to be present, and I have also observed some 
small lacunae within the perisoma, which doubtless are in communication with those 
radial vessels. Even the elevations in the neighbourhood of the anus contain lacunae. 
Here and there some very minute darker points are visible, and these possibly may form 
a kind of ambulacral appendage. It seems hardly credible that these two forms, which 
bear such an obvious resemblance to Pseudostichopus, especially Pseudostichopus 
villosus, can be totally in want of pedicels. That which makes the investigations of 
the ambulacral appendages difficult and their results very dubious, is the absence of 
calcareous deposits in the perisoma. 
The two specimens in question are very large, from 220 to 280 mm. long, and of an 
oval form. Their colour is pale dirty grey, inclining to brownish. The mouth is almost 
terminal, though turned toward the ventral surface. The anus is almost terminal and 
enclosed between two vertical folds of the body-wall. The twenty tentacles seem to be 
discoidal and carry some small retractile processes. The body- wall is very thin, excepting 
along the sides of the body, where it is slightly thicker. The longitudinal muscular 
bands are broad and simple. The retractors are absent. The calcareous ring (PL X. 
fig. 14) is devoid of any posterior prolongations, and is notched anteriorly for the 
longitudinal muscles, &c. A single ventral Polian vesicle and dorsal madreporic canal are 
present. A bundle of short, thick, slightly branched genital tubes is situated on each 
side of the dorsal mesentery ; the branches of these tubes terminate in oval sacciform 
dilatations, which in the individual examined by me contained eggs. The respiratory- 
trees are comparatively well-developed. It is impossible to decide whether deposits 
have been present in the perisoma or not, though I believe the former to be the case. 
