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THE VOYAGE OE H.M.S. CHALLENGEK. 
ventral ambulacra. Anus with teeth. Deposits — reticulate spheres or cnps ; 
large scales. 
Habitat. — Bowen (Ludwig). 
(Mus. Holm.) Two specimens, 18 mm. long, from Bowen in Australia. Besides 
the large scales and the cups, I find in the perisome other bodies, which seem to 
resemble the “ buttons ” in Colochir'iis australis, and are probably developmental 
stages of scales. For the rest, the specimens fuUy agree with those described 
by Ludwig. It seems not incredible that Colochirus minutus is a younger form 
of Colochirus australis. 
Colochirus australis, Ludwig, 1875. 
Body quadrangular. The two dorsal ambulacra with one or two rows of papillae. 
Two, seldom three, rows of pedicels in each of the ventral ambulacra. Anus 
with small teeth. Deposits — reticulate half spheres or cups ; numerous 
knobbed buttons ; large scales. 
Habitat. — Bowen and Sydney (Ludwig), Port MoUe and Port Jackson (Bell). 
(Mus. Holm.) Two individuals from Port Jackson and one from Bowen. The 
largest, 70 mm. long. The papillae, forming an alternating double row on the 
two dorsal ambulacra, pass out from a low hard knobbed wart. As usual in 
this genus, papillae may also be found anteriorly and posteriorly on the three 
ventral ambulacra. Interambulacra naked. Those pedicels which form the 
outer row in the two lateral series seem either to issue from very low knobby 
warts or to be surrounded at the base by calcareous knobs. The larger 
and smaller scales do not imbricate, except at the posterior end of the body. 
The knobbed buttons, seldom of a more symmetrical form, often become 
developed into irregular spheres. 
II. Dorsal papillae scattered on the ambulacra as well as interambulacra. 
Colochirus australis, var. armatus, von Marenzeller, 1881 ; Ludwig, 1883. Colochirus 
armatus, v. Marenzeller, 1881. 
Habitat. — Japan (v. Marenzeller and Ludwig). 
This variety differs mainly from the species itself in that even the dorsal inter- 
ambulacra carry small warts with papillse, and in that three to four rows of 
warts are present along the dorsal ambulacra. The scales are also smaller 
and the skin thinner. 
Colochirus cylindricus. Semper, 1868. 
Body cylindrical, slightly flattened below. Dorsal surface with crowded, larger and 
smaller tubercles with papillse. Two to three rows of pedicels in each 
