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THE VOYAGE OF H.M.S. CHALLENGER. 
almost destitute of such plates and rods, or provided with very few. I also found two or 
three smooth buttons with six holes, but these probably belong to another animal. 
The specimens of Stichopus japonicus described as types seem to have the disks of 
the incomplete tables smooth. 
Stichopus haytiensis, Semper, 1868 (?) (PI. VII. fig. 5). 
Habitat. — Bermuda ; a single incomplete individual. 
Having examined only a single specimen, which is very contracted and deformed, I 
cannot be fully certain of the exactness of my determination. The ventral pedicels 
are disposed in three longitudinal series ; Semper mentions five such series. The 
arrangement of the dorsal ambulacral appendages is not fully known ; I only find a 
row of larger conical prominences along each side of the body, but I must leave it 
undecided whether the remaining prominences ( = papillae) are disposed in rows or not. 
The tentacles are twenty, of unequal size. The colour is darkish chocolate-brown, 
lighter on the ventral surface. All the internal organs are spoiled, excepting the 
calcareous ring, which is peculiar in having its radial pieces bifurcated posteriorly ; the 
respective pieces do not seem to be of equal size. The calcareous deposits consist of very 
thinly scattered C-shaped bodies, about 0'05 mm. long (PI. VII. fig. 5, f), and very 
numerous crowded tables (PI. VII. fig. 5, a, b, c), with the disk mostly pierced by a larger 
central hole surrounded by a ring of smaller holes ; the margins of these disks are often 
more or less uneven, but never spinous. The spire of the tables has a single transverse 
beam, and terminates regularly in twelve teeth or spines ; sometimes, however, the top 
of the spire is provided with more spines. The tables are about 0'044 mm. high. In 
the pedicels and dorsal processes the disks of the tables are often reduced to a simple 
calcareous ring, combining the bases of the four rods which constitute the spire (PI. VII. 
fig. 5, d). The ventral as well as dorsal ambulacral appendages are strengthened by 
numerous transverse, simple, or branched irregular rods. Semper does not mention 
anything about the characteristic shape of the calcareous ring (PI. VII. fig. 5, e) which 
is present in the animal brought home from Bermuda, wherefore it is possible that this 
form, on account of this peculiarity, represents a new variety. 
Stichopus variegatus, Semper, 1868 (PI. VII. fig. 7). 
Habitat. — Zebu Beefs (Philippine Islands) ; a single specimen. 
The very contracted and deformed individual is doubtless a young form, its length 
in the contracted state being only about 120 mm. The colour is yellowish-grey 
inclining to brownish, lighter on the ventral surface. There are twenty yellowish 
tentacles. The pedicels are disposed in three distinct series, the two lateral composed of 
