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THE VOYAGE OF H.M.S. CHALLENGER. 
not very clear in the contracted and wrinkled specimens which I have had at my disposal. 
A single madreporic canal and three Polian vesicles present. Deposits — numerous 
C-shaped bodies (PI. VII. fig. 6, e) ; tables (Ph VII. fig. 6, a, b, c ) ; besides, I have found 
a very few incomplete rosettes or dichotomously branched bodies (PI. VII. fig. 6, d) 
which were absent in the typical specimens examined by Selenka and others. Concerning 
the shape of the deposits, I refer to the plates. The pedicels contain spinous rods which 
are mostly enlarged and perforated at their middle (PL VII. fig. 6, g). The dorsal 
appendages are also strengthened by numerous curved, simple or branched rods. The 
presence of the rosettes is the only difierence from the typical forms ; possibly they are 
peculiar to the forms from the above-mentioned stations — or they have escaped my 
predecessors through their scarcity. 
Sticliopus japonicus, Selenka, 1867 (?) (PL VII. fig. 3). 
Habitat. — Japan, March 14, 1875 ; from pools ; a single specimen. 
The specimen does not quite agree . with the descriptions of Selenka and von 
Marenzeller, but, nevertheless, I do not think it possible to refer it to any other species. 
The dorsal surface is dark reddish-brown, while the ventral surface is light. A simple 
row of seven to eight rather considerable conical prominences is situated along each side 
of the body, corresponding to the lateral ventral ambulacra, and another more irregular, 
double, or alternating row of equally large prominences is present along each dorsal 
ambulacrum. Small scattered papillae are also to be found all over the dorsal surface. 
The ventral pedicels are much more crowded, but from the contracted condition of the 
perisome it is impossible to distinguish any arrangement of them in longitudinal series. 
From the inside of the body, on the contrary, it is easy enough to find a longitudinal 
space along the middle of the two ventral interambulacra free from pedicels. So 
far my observations seem to agree with those of Selenka and von Marenzeller. It 
is especially with regard to the deposits that disagreements exist, which render the 
correctness of my determination dubious. 
The tables have the same shape as described by von Marenzeller (PL VII. fig. 3, a, b), 
but, besides these, I find a great quantity of small rounded or oval perforated plates 
(PL VII. fig. 3, c), some of which bear a certain resemblance to buttons. Selenka also 
described such bodies under the name of “ Hemmungsbildungen.” The pedicels possess, 
besides terminal plates, tables and the above named small plates, elongated button-like 
plates with two longitudinal rows of holes (PL VII. fig. 3, c?) ; these plates, which have 
a length of about 0‘15 mm. or more, are often somewhat deformed, rod-like. The 
papiUse, on the contrary, are characterised not only by such elongated plates, but also by 
curved spinous transverse rods (PL VII. fig. 3, e). Neither Selenka nor von Marenzeller 
mentioned anything about these deposits which I find in the dorsal papillse. 
