100 
THE VOYAGE OF H.M.S. CHALLENGER. 
gular plates with very uneven or spinous margins, with a few larger holes and 
with distinet spines on the exterior surface. Calcareous ring without posterior 
prolongations. 
HcMtat . — Iquique (Semper). 
Cucumaria grubii, von Marenzeller, 1874. Cladodactyla dicquemari, Grube, 1840. 
Cucumaria dicquemarii, Sars, 1857. 
Body fusiform. Pedicels of the ventral ambulacra in three to four rows, those of the 
dorsal ambulacra in two to three rows ; towards the extremities of the body the 
pedicels form one or two zigzag rows. Deposits — numerous thick, oval or 
elliptic buttons with numerous conical knobs or spines and minute round holes ; 
smaller scattered buttons with round knobs and no holes ( = developmental 
stages); a very few minute rods or spicules ( = undeveloped cups) in the exterior 
layer of the perisome. 
Habitat . — Mediterranean Sea (Grube, Sars, v. Marenzeller, Ludwig). 
Cucumaria macidata, Semper, 1868. 
Body ovate. Ventral pedicels arranged in four to six rows in each ambulacrum, the 
dorsal ones in two to three rows. Radial pieces of the calcareous ring with 
two long posterior prolongations. Deposits — scattered massive tables with the 
small disk uneven or spinous in the margin and perforated with four central 
holes, and having the spire resembling a simple column with strong spines at 
the top. In the pedicels the spire of the tables becomes much longer and the 
disk deformed and reduced to a spherical network. 
Habitat . — Bohol (Semper), Port Jackson (Bell). 
Cucumaria crucifer a, Semper, 1869. 
Body swollen. Ventral pedicels in four to six rows in each ambulacrum ; the dorsal 
ones in only two rows. Calcareous ring without posterior prolongations. 
Deposits — large buttons resembhng those in the Aspidochirotee ; and cruciform 
more or less spinous bodies. 
Habitat . — Aden (Semper). 
According to the figures, given by Semper, minute incomplete rosettes may also be 
present in the integument. 
Cucumaria glaberrima, Semper, 1869. 
Body swollen. Ventral pedicels in six to eight rows in each ambulacrum ; the dorsal 
ones in only two or three rows. Calcareous ring small and without posterior 
prolongations. Deposits — scattered thick disk-like plates with dentate margin 
and four small holes. 
Habitat . — Aden (Semper), Berbera (Ludwig). 
