EEPOET ON THE HOLOTHUEIOIDEA. 
185 
disks of the tables are very symmetrical, star-like, with six larger holes round the 
smaller central aperture (PL X. fig. 8). Only a simple row of from nine to fourteen 
elongated pedicels is present on each side of the ventral surface ; besides these, no other 
pedicels or papillEe seem to exist. In one individual I observed thirteen small tentacles. 
Holothuria thomsoni, var. liyalina, nov. 
Habitat. — Station 158, March 7, 1874; lat. 50° P S., long. 123° 4' E.; depth, 1800 
fathoms ; bottom temperature, 33°'5 ; Globigerina ooze. 
The single specimen obtained by the Challenger Expedition has a length of 68 mm. 
Its body-wall is glassy from numerous crowded tables, exactly like those in the type 
form excepting that the three teeth of their spire are less spinose. Tentacles fifteen. 
The pedicels are not very distinct, but, so far as I can judge from the incomplete 
specimen at my disposal, they are few and arranged in a simple row along each side 
of the ventral surface. Having been unable to detect any other peculiarities, I 
propose for the present to consider the specimen in question as a variety of Holothuria 
thomsoni. 
Holothuria murrayi, n. sp. (PL X. figs. 16-18). 
Body elongated, more or less distinctly cylindrical, with mouth and anus almost 
terminal. Tentacles twenty. Each lateral ventral ambulacrum with numerous pedicels, 
the larger of which seem to form a continuous row along each side of the body ; the 
remaining pedicels are of unequal size, and sparsely distributed over the adjacent inter- 
ambulacra. The odd ambulacrum with numerous, very minute, almost imperceptible 
pedicels. Dorsal surface with few, small, and scattered papilla-like pedicels. The dorsal 
as well as the ventral interambulacra have only a few minute ambulacral appendages in 
their middle line. Perisome thin, fiexible, and rough from closely placed tables, consisting 
of a more or less irregular, perforated disk, typically with six large holes round a 
central hole, and a spire built up of three rods and one transverse beam. The spire 
terminates in three rather long teeth, the free ends of which are spinose or branched. 
Colour in alcohol, greyish inchning to violet, which is especially obvious along the 
middle of the ventral surface ; some larger violet spots are visible on the dorsal 
surface, evidently indicating that this colour predominates during life. Length, 
240 mm. 
Habitat. — Station 300, December 17, 1875 ; lat. 33° 42' S., long. 78° 18' W.; depth, 
1375 fathoms ; bottom temperature, 35°‘5 ; Globigerina ooze ; two individuals. 
The mouth is slightly bent towards the ventral surface. The cylindrical pedicels of 
the ventral ambulacra meet each other in the middle of the interambulacra, where, 
(ZOOL. CHALL. EXP. PAET XXXIX. 1886.) Ql ^4 
