KEPORT ON THE HOLOTHHRIOIDEA. 
225 
Another specimen, which is preserved in the State Museum at Stockholm, evidently 
belongs to this species. It is of a light greyish-brown colour, with a row of 
about ten dark spots along each dorsal ambulacrum. The dorsal ambulacral 
appendages have a slightly conical form. The spire of the tables is more or 
less reduced. The buttons are robust and collected in larger and smaller circles. 
A third specimen from Eooa, belonging to the Godeffroy Museum, bears a great 
resemblance to the former, though the dorsal spots are not very distinct, and 
the circles of irregular buttons give to the surface of the skin a granulated 
aspect. Even here the small scattered dorsal appendages resemble papillte. 
Holothuria subditiva, Selemka, 1867. 
Habitat. — Panama (Elorida ?) (Selenka), Surinam (Semper). 
Closely allied to the preceding species, and distinguishable from it mainly by the 
buttons not being collected into groups or circles. It possesses the two rows of 
dark spots along the back. 
Holothuria Zwea^a, Ludwig, 1875. Lahidodemas punctulatum,TLa.OiCke,, 1880 (according 
to Ludwig, 1883). 
Habitat. — Bowen and Eed Sea (Ludwig), Mauritius (Ludwig, Haacke), Thursday 
Island (BeU). 
According to Ludwig, this species is nearly related to Holothuria fardalis, and, for 
my own part, I find it almost impossible to distinguish them from each other. 
In the Zoological State Museum at Stockholm I examined two specimens, 
one from Wallis Island and one from Rockhamj^ton, the former differing from 
the typical Holothuria pardalis only in the circumstance that the rather asym- 
metrical buttons are scattered, the latter agreeing more with it in having the 
buttons collected into masses but not into distinct rings or circlets. Colour — 
dirty yellowish-grey, speckled with brownish, paler along the ambulacra, the 
three ventral of which are marked out by a fine darker line. Anus with a 
crown of small papillae. Buttons asymmetrical and mostly incomplete. The 
tables have not so large a disk, as indicated by the figures of Ludwig, and the 
spines on the margin seem to be fewer, often eight, and larger ; the spire is 
seldom complete, and is then very short with about eight teeth. Tentacles 
and calcareous ring imcommonly small. Wlrat is the difference between this 
species and Holothuria subditiva ? 
Holothuria peregrina, Ludwig, 1875. 
Habitat. — Bowen and Upola at Navigator Islands (Ludwig), Thursday Island (Bell). 
Like the two preceding species. A re-examination is necessary. 
(ZOOL. CHALL. EXP. PART XXXIX. 1886.) 
Qq 29 
