168 
THE YOYAGE OF H.M.S. CHALLENGER. 
six holes, though there seems to be but little doubt, that these belong to another animal 
and have adhered to the skin of the individuals examined by me. The diameter of the disks 
is about 0’05 mm., and the spire attains a height of about 0‘04 mm. The fenestrated, 
irregularly bilateral plates (PI. VIII. fig. 3, d) of the pedicels are rather large. So far as 
I can find out, this form brought home by the Challenger Expedition cannot be referred 
to any previously known species, though it doubtless bears some resemblance in external 
organisation to Stichopus armatus, Selenka, and Stichopus japonica, Selenka. 
Stichopus godeffroyi, var. h, Semper, 1868 (PL VII. fig. 8). 
Habitat. — Sandwich Islands ; a single individual. 
The only specimen at my disposal being very wrinkled, deformed, and covered with 
sea-weed, I cannot determine how the dorsal ambulacra! appendages are arranged. A 
simple row of conical protuberances is easily enough distinguished along each side of 
the body, but I am by no means sure of the arrangement of the remaining dorsal append- 
ages. However, I think I have observed some protuberances on the dorsal ambulacra, 
and, also, some small scattered papillae on the interambulacra. The colour is yellowish- 
grey inchning to brown, lighter on the ventral surface. Two Polian vesicles and a single 
dorsal madreporic canal are present. The calcareous ring is like that in Stichopus horrens, 
Selenka ; the radial pieces have four tops anteriorly, and the interradial a single one. 
Deposits — large tables (PI. VII. fig. 8, /, g) with the spire terminating in a single conical 
top ; large and small tables with the spire terminating in several teeth (PI. VII. 
fig. 8, a, 6, c); C-shaped bodies (PI. VII. fig. 8, e); and dichotomously branched bodies 
(PI. VII. fig. 8, d). The large tables seem to be present only in the dorsal perisome, have 
a height of 0T2 mm. to 0T4 mm., and their large irregularly rounded disks are 
pierced by numerous holes and have a diameter of about 0T2 mm. The small tables are 
present all over the body, and measure about O' 04 mm. in height ; their spire terminates 
in about twelve teeth, and their disks are either rounded or angular. Besides these 
tables, one finds in the dorsal body-wall other tables of the same appearance but of 
much greater dimensions, their height being about 0'08 mm. and the diameter of their 
disks measuring as much as 0'072 mm. The C-shaped bodies have a length of about 
0‘14 mm., but those on the ventral surface seem to be smaller. The dichotomously 
branched bodies or rosettes are small, about 0'036 mm. in length. The pedicels as 
well as the dorsal ambulacral appendages are strengthened by strong, slightly curved 
rods, of which those in the former are usually dilated at the middle and perforated, while 
the dorsal rods, more curved, only have some finely spinous branches at the middle, 
which are sometimes united so as to form a single or a few holes. 
The species is doubtless very nearly allied to Stichopus horrens, and if it can be 
shown that the Challenger specimen has the dorsal appendages in rows on the ambulacra 
only, it may be referred to that species. 
