REPOET ON THE HOLOTHUEIOIDEA. 
177 
Holothuria martensii, Semper, 1868 (PL VII. fig. 12; PI. XVI. fig. 2). 
Habitat . — Station 188, September 10, 1874; lat. 9° 59' S., long. 139° 42' E.; 
deptb, 28 fathoms; green mud; a single specimen. Station 203, October 31, 1874; 
lat. 11° 6' N., long. 123° 9' E.; deptb, 20 fathoms; mud; one individual. 
In the contracted state the body has a length of 150 mm., and is provided with 
conical papillae, which become largest towards the sides of the body, where they form a 
longitudinal series along the line of junction of the dorsal and ventral surfaces. The 
largest papillae have a length of about 7 mm. and a breadth at the base of about 4 mm. 
The papillae, which are not very closely^ placed, decrease towards the middle of the dorsal 
and ventral surfaces ; those on the dorsal surface being slightly more numerous and 
more distinctly pointed than the ventral ones, which seem to be more rounded. 
The closed mouth, which is ventral in position, is surrounded by a circle of smaller 
papillae. The anus is terminal, roundish, and has a few very small papillae on the margin. 
The tentacles are twenty (?), fully retracted and small. Tlie colour is whitish or pale 
greyish on the sides, and darker on the dorsal and ventral surfaces from numerous, 
crowded, minute, brownish specks. The inside of the perisome is characterised by 
numerous small dark dots. 
The calcareous ring (PI. VII. fig. 12, c) is of the usual shape without posterior 
prolongations. The madreporic canal, 10 mm. long, terminates in a pear-shaped end. 
A single Polian vesicle, about 50 mm. long, is present. The genital tubes are twice or 
three times dichotomously branched. A thick bundle of short Cuvierian organs is present. 
The calcareous deposits closely resemble those in Holothuria ocellata, to which this 
species is nearly related, excepting that the tables are provided with an elongated 
conical spire composed of four rods and as many as six or seven transverse beams. The 
top of the spire generally carries several small spines, but I have also found tables 
which are almost devoid of spines. Sometimes the four rods which constitute the 
spire of the tables carry spines, but I never found such large ones as those figured 
by Semper. The disk of the tables is rather large and pierced by more holes than in 
Holothuria ocellaia. The tables (PI. VII. fig. 12, a, h) measure from OT mm. to 0T6 mm. 
in height. The papillae have almost a spinous appearance from the long spires of the table. 
The numerous buttons and supporting rods of the papillae are exactly like those in the 
above-named species. In this specimen also many elongated buttons with numerous 
holes in two rows are to be found, but those with six holes are the most common. The 
elongated buttons with numerous holes are rarer, and it is to be observed that the 
knobs on these are less prominent, sometimes nearly inconspicuous. Though the 
specimen does not fully agree with the description given by Semper, the similarity is 
very obvious. The specimen examined by Semper is much smaller. 
The papillae are supported by numerous solid rods which are either perforated at 
(ZOOL. CHALL. EXP. — PART XXXIX. 1886.) Q*! 
