104 
THE VOYAGE OF H.M.S. CHALLENGEE. 
pedicels the tables commonly have an elongated disk supporting a more or less 
rudimentary spinous spire. !N’o true supporting rods seem to be present in the 
pedicels. 
Cucumaria citrea, Semper, 1868. 
Body pentangular, with numerous pedicels along the angles. Deposits — plates and 
tables ; the former small, rectangular, with a few holes, the two central of which 
are often larger ; the latter consisting of a disk, mostly pierced with only four 
large holes, and a spire made up of two rods or legs, which are not connected 
by transverse beams. Each of the ten portions of the calcareous ring composed 
of numerous small pieces ; the five radial portions with two slender posterior 
prolongations. 
Habitat — Bohol (Semper). 
Semper does not mention anything about the arrangement of the pedicels in each 
ambulacrum, whether they form two or more rows, wherefore I am not sure 
whether this species belongs to this group of Cucumaria. Besides the two 
kinds of deposits mentioned above. Semper figures a small calcareous body 
resembling an undeveloped rosette. 
e. Deposits — irregular spinous rods or spicules. 
Cucumaria nigricans {Cladodactyla, Polyclados),^mndit, 1835; Selenka, 1867; Ludwig, 
1881. Pentacta nigricans, Stimpson, 1857. (?) Pentacta pi'perata, Stimpson, 
1864. 
Body elongated, ovate. The calcareous rods only present in the bivium. Pedicels 
devoid of terminal plates. No calcareous ring. 
Habitat. — Sitka (Brandt, Ludwig), (?) Puget Sound (Stimpson). 
f. Deposits — reticulate spherical bodies, ellipses or cups alone or 
together with scales.. 
Cucumaria semperi, Bell, 1884. 
Body pentangular. Deposits — spherical bodies alone, made up of a central four- 
armed spicule, an oval smooth rim, thus constituting four larger holes, and one 
beam crossing the bodies at the middle. Supporting rods of the pedicels 
resembling folding eye-glasses. Calcareous ring, as in Cucumaria citrea, composed 
of a number of pieces. 
Habitat. — Port Denison and Torres Strait (Bell). 
To judge from the figure drawn by Bell, the deposits may be like oval “ cups,” pierced 
with four holes, and with the opening crossed by a beam ; but these “ cups ” 
are somewhat different from those common in several species of Cucumaria. 
