204 
THE VOYAGE OF H.M.S. CHALLENGER, 
bands ; the latter is of a dark reddish-brown colour and measures about 
180 mm. in length. Even here I found among the dorsal pedicels some 
appendages, which are conical and possess a rudimentary terminal plate. In 
the specimen from the Fiji Islands the anus is very distinctly stellate. I must 
confess I cannot distinguish this form from the two preceding ones. They are 
most probably only varieties of one and the same species. 
II, Arras indistinctly or not at all stellate. 
Holothuria tenuissima. Semper, 1868. 
Anus slightly stellate owing to five groups of papillae. Pedicels all over the body. 
Deposits — incomplete rosettes like those in the above mentioned forms ; some of 
them possibly more resembling minute slightly branched rods. 
Habitat. — Bohol and Navigator Islands (Semper), Indian Ocean, Timor and Padang 
(Ludwig). 
(Mus. Holm.) One individual agreeing in all respects with the description of 
Semper. Semper himself says that no other difference exists between this 
form and Holothuria vitiensis than that of the arrangement of the Cuvierian 
tubes, and he therefore seems very much inclined to refer them to the same 
species. 
Holothuria hoellikeri, Semper, 1868. 
Habitat. — Navigator Islands (Semper).. 
Scarcely to be distinguished from- the preceding species. The anus does not seem 
to be stellate. 
Holothuria clemens, Ludwig, 1875. 
Habitat. — ^Navigator Islands (Ludwig). 
Anus surrounded by fifteen small papillae. Is scarcely to be distinguished from Holo- 
thuria tenuissima or Holothuria koellikeri, to which forms it bears the nearest 
resemblance. 
Holothuria similis, Semper, 1868. 
Habitat. — Bohol (Semper). 
According to Semper, fine papillae exist all over the body. For the rest, I cannot 
find any character of such importance as to justify its being regarded as a 
distinct species. I feel almost convinced myself that we have to do with a 
single species or with a few species capable of great variations, and that most of 
the above seven species may be justly considered as young or varieties. 
