208 
THE VOYAGE OF H.M.S. CHALLENGER. 
Holothuria languens, Selenka, 1867. 
Pedicels all over the body. Tables consisting of a spire alone, built up of four rods 
and one transverse beam ; the spire bears spines at the annular base and round 
the truncated top. 
Habitat . — Panama (Selenka), Surinam and British Guiana (Semper). 
Holothuria dietrichii, Ludwig, 1875. 
Pedicels all over the body. The oval or rounded smooth disks of the tables are 
regularly perforated with four holes, and support a spire reduced to two rods 
anastomosing near the free ends. 
Habitat . — Bowen and Hong Kong (Ludwig). 
The tentacles, calcareous ring, &c., were destroyed in the specimens examined by 
Ludwig. 
II. Tables complete, but with, the disks small, annular and spinous in the margin. 
Holothuria pertinax, Ludwig, 1875. 
The ventral pedicels forming a simple row along each side and a double one along the 
middle. Dorsal papUlae irregularly scattered. Tables equally broad and high ; 
the short spire is made up of four rods and one transverse beam, and its 
truncated top terminates in teeth. 
Habitat . — Navigator Islands (Ludwig). 
Even the calcareous ring is of uncommon construction, its interradial pieces being 
transformed into very slender narrow curved bands, much longer than the 
radial. 
Holothuria imitans, Ludwig, 1875. 
Ventral pedicels and dorsal papillae scattered. The elongate spire built up of four rods 
and one transverse beam, with the rounded top carrying spines or teeth. 
Habitat . — Navigator Islands (Ludwig). 
III. Tables complete, made up of a smooth, usually well-developed, perforated disk 
supporting a distinct spire. 
Holothuria modesta, Ludwig, 1875. 
Papillae all over the body. The roundish smooth disk of the tables is pierced with about 
eight holes, and carries a long conical spire made up of four rods and several — 
about four — transverse beams ; the top of the spire terminating in several teeth. 
Habitat . — Cape York (Ludwig), (?) Torres Strait (Bell). 
According to Ludwig, like Holothuria martensii in internal and external organisation. 
