REPORT ON THE HOLOTHURIOIDEA. 
237 
Holothuria martensii, Semper, 1868. 
The tables have a smooth or slightly uneven disk and a long spire composed of four 
rods and three to five transverse beams. The buttons commonly provided with 
six holes and two knobs on the middle beam. 
Habitat . — Amboina (Semper), Celebes and Banda (Ludwig). 
(Mus. Hohn.) One specimen from Banka and another from Damley Island. Con- 
cerning my own researches regarding these specimens, I may refer to what is said 
with regard to the Challenger specimens (p. 177), with which they agree in most 
respects. It may, however, be pointed out that the disks of the tables in the 
latter specimen seem to be considerably larger and more irregular, and that the 
spire seems to be longer ; even the buttons have generally more holes and 
knobs, and attain a greater length. 
3. Buttons of two hinds, smooth and knobbed. 
Holothuria squamifera, Semper, 1868. 
In addition to the smaller more numerous tables of the usual shape, much larger ones 
may be found, having the disk more richly perforated and the spire long, narrow, 
and provided with several transverse beams (about five). The smooth buttons 
have eight to twelve holes ; the knobbed ones are less common and of slightly 
more irregular shape. 
Habitat . — Philippine Islands, Navigator Islands, and Java (Semper). 
The papillse of this species are scale-hke, and the mouth is surrounded by small 
groups of papdlae. 
Holothuria cubana, Ludwig, 1875. 
The tables have a knobbed disk and a short spire terminating in numerous teeth. 
The smooth buttons are slightly deformed, resembling oblong plates with uneven 
margins and a few small holes. The knobbed buttons are oval, symmetrical, 
commonly pierced by ten holes, and carrying numerous knobs. 
Habitat . — Cuba (Ludwig). 
The following forms are mostly very incompletely known and in need of re- 
examination : — 
Holothuria ecalcarea, Sars, 1859 and 1861. 
Habitat . — Pinmark (Sars), White Sea (Jarzynsky). 
Nearly allied to Holothv/ria tremula, and probably identical with it, the calcareous 
matters having probably been dissolved by some impurity in the alcohol. 
