REPORT ON THE HOLOTHURIOIDEA. 
71) 
Though the animal in question cMers greatly in several respects from the typical 
representatives of Colochirus, it cannot be referred to any other hitherto known genus. 
The pedicels are rather large, cylindrical and retractile, with a well-marked sucking-disk. 
The three longitudinal series, into which they are collected, are broadest near the 
middle of the body, ’where four, five, or even six pedicels are placed side by side. 
Anteriorly and posteriorly each series decreases and consists finally of a double row of 
“ papillae ” which have taken the place of the pedicels. The papillae are very small, . 
with broad rounded base and pointed top ; they are scattered over the dorsal ambulacra 
and interambulacra, those belonging to the ambulacra being slightly larger, 2 or 3 
mm. long. Even the ventral interambulacra carry such papillae, which are more 
closely placed towards the middle of the ventral surface, especially along the sides of 
the series of pedicels ; when retracted, the ambulacral appendages or papillae which have 
their place in the neighbourhood of these series almost resemble the true pedicels, but 
differ from them mainly by their smaller size. Only very few are extended, and these 
present a conical form. The groups of larger papillae round the mouth are well marked, 
each group is composed of tw^o or three papillae united at their bases. The anal teeth 
are hard and rounded, measuring about 4 mm. in length and breadth. 
The calcareous ring (PI. V. fig. 4a) is very strongly constructed, and measures 
about 37 mm. in diameter ; it is composed of ten pieces without any posterior prolonga- 
tions. The madreporic canal is single, dorsal, and attached to the mesentery. 
The single Polian vesicle is very voluminous, and has a length of 50 mm. The 
retractors are slender, attached at about the first third of the body. The reproduc- 
tive organ consists of two very thick bundles of simple, unbranched, narrow tubes, 
from 40 to 50 mm. long. The ampullse of the pedicels and papillae depend freely 
into the peritoneal cavity and have a considerable length, those belonging to the 
pedicels measuring 12 mm. The cloaca and the respiratory organs are well developed. 
The most obvious characteristic of the species in question is to be found in the 
deposits, which, instead of filling up the perisome, making it hard and inflexible, are 
comparatively small and scattered. They present a very irregular aspect (PL V. fig. 4&), 
some being round, oval or elongate, and usually pierced by very few holes, others 
resembling rods or x -shaped bodies. The more strongly developed oval deposits measure 
0'09 or OT mm. in length, and bear some resemblance to buttons. The pedicels 
contain, excepting terminal plates, very few perforated rod-like plates near their 
extremities (PI. V. fig. 4c). The small papillae are even strengthened by a fev 
irregular rods and a very feebly developed terminal plate ; sometimes they almost 
seem to be devoid of deposits. In the larger papillae, which I have been able to 
examine, I have found larger irregular thick scales composed of several reticulate la}eis, 
and even, though more rarely, simple perforated plates. These scales have a diametei 
of 0’6 mm. 
