40 STAR-FISHES, SEA-URCHINS, ETC. 
bra of Zamboanga lives an entirely different fish (Zxchely- 
ophis vermicularis). 
Se a ae 
ats 
AN NEA SU, 7 
bia TIL. ae 
Fic. 38.—Sea-cucumber (Holothurda lutea), showing tentacle-like gills. 
NotTEe.—The common Pentactes of the North lies buried in the sand, 
the tentacle-like gills resembling mosses of various kinds. In some 
species they look like toadstools ; others resemble broad leaves or short, 
delicate shrubs, and, when concealed in the sand, these mimicking 
mouth-parts are thrust up, and wave to and fro in the current, deceiv- 
ing the shrewdest of their enemies. , 
Development.—The young are devel- 
oped much as in the star-fishes ; some 
are at first free swimmers by means of 
cilia, and pass through change of forms 
as curious and distinct as in many in- 
sects (Fig. 40), while others appear at 
Fic. 39.—Anchor- . 
plate in Synap- _ first in the adult form, and are protect- 
ta, magnified. ed in nurseries called marsupiums. 
VALUE.—Over 1,000 vessels are engaged in the trepang-fisheries 
of the East. The yearly shipment of them from Macassar alone amounts 
