EEPOET THE HOLOTHTJEIOIDEA. 
193 
Stichopus tizardi, Theel, 1882. 
Hahitat . — Eseroe Channel (Theel). 
When I first descrihed this species I had only some fragments at my disposal. 
Lately I have received some new specimens dredged at about the same locality, 
but imfortunately even these are very deformed and macerated, consequently 
their true shape is difficult to state. The following may complete the former 
description. Body elongate, equally rounded at each extremity, flattened. 
Mouth ventral, with twenty yeUow tentacles. Anus subdorsal. Dorsal surface 
with conical processes, few in munher, of unequal size, the largest measuring 5 
to 10 mm. in length ; those processes which attain a greater size are thinly 
placed on or in the neighbourhood of the two dorsal ambulacra, while the 
smaller are to be found partly in very limited numbers scattered among the 
larger, partly more crowded, forming a simple row along the sides of the body 
and round its anterior extremity. The pedicels probably form a double row 
along each lateral ventral ambulacrum, but on the odd ambulacrum, marked 
out by a deep furrow, I could not convince myself of the presence of any such 
appendages. The calcareous ring is very reduced, in the larger specimens 
absent. Two genital bundles, one on each side of the dorsal mesentery. A 
single Polian vesicle and madreporic canal. Body-wall thick, strengthened by 
C-shaped bodies and tables. In some parts of the body the spires grow 
much larger, and possess much more numerous transverse beams ; in others 
all the tables become very robust, with a greater number of holes in the 
highly dilated ends of the arms, and with the spire more irregularly developed 
and highly spinous. As a rule, the four rods which constitute the spire are 
almost parallel and provided with spines. The dorsal processes carry numerous 
spinous rods and tables with very long sj)ires. 
B. C-shaped bodies absent. Tentacles twenty. 
1. Dorsal ambidacral appendages on the OAnbulacra as well as interambidacra. 
a. Deposits — tables like those in Stichopus tizardi. 
Stichopus natans (Holothuria), Sars, 1868, 1871. 
Habitat . — West coast of Norway and Sognefjord (Danielssen and Koren, Storm), 
Lofoten, Bergen, Hardanger (Sars). 
(Mus. Holm.) Three types from Norway. 
The species differs from the preceding one by the lack of C-shaped deposits ; for the 
rest they seem to be very nearly related. Even Sars states the absence of 
pedicels on the odd ambiilacrum. Some of the dorsal processes attain a con- 
siderable length, about 23 mm., especially those situated on or near the dorsal 
ambulacra. 
(ZOOL. CHALL. EXP. PART XXXIX. — 1886.) 
Qq 25 
