114 
THE YOYAGE OF H.M.S. CHALLENGEE. 
Cucumaria nohilis, Ludwig, 1875. 
Body swollen. Dorsal interambulacral pedicels more frequent than the ventral 
which are very rare. Deposits — tables, made up of a roundish, irregular, 
perforated disk, and a short spire composed of two to four rods. Calcareous 
ring devoid of posterior prolongations. 
Habitat — Off Norway (Ludwig). 
Cucumaria vega, n, sp. 
Body more or less obviously curved, tapering nearly equally towards each extremity. 
Tentacles ten, two ventral smaller. Anus with five teeth, made up of a calcareous 
network. Pedicels in a distinct double row on each of the ventral ambulacra 
and in a less distinct double row on the two dorsal; smaller pedicels are also to 
be found scattered over the five interambulacra of the larger specimen, while in 
the smaller individuals the ventral interambulacra seem to be almost naked. 
A single Polian vesicle and madreporic canal present. Calcareous ring very 
slender, devoid of posterior prolongations. Deposits more thinly scattered, of 
two kinds; smooth rods, typically with a hole in each slightly enlarged end, 
thus resembling spectacles, but often of a more irregular form, more or less 
curved, with several, often three, holes placed at each end; and here and 
there smooth plates with uneven, undulating margin, and pierced with a varying 
number of round holes. The surfaces of the plates and rods are not quite 
level, owing to some very low, nearly inconspicuous elevations. Pedicels with a 
very fragmentary terminal plate or none at all, but devoid of any other support- 
ing rods than such as are found in the body-Wall itself. Length of the largest 
specimen, 38 mm. Colour in alcohol; dorsal surface and the ends of the body 
dirty brown; ventral ' surface yellowish-grey. Possibly this species may be 
nearly allied to Cucumaria nigricans. 
Habitat . — Behring Island (Mus. Holm.). 
Cucumaria per spicua, Ludwig, 1875, 
Body swollen. Pedicels much more numerous in the ventral ambulacra than in the 
dorsal, but, on the other hand, less numerous in the ventral interambulacra than 
in the dorsal. Excepting terminal plates in the pedicels, no deposits. Calcareous 
ring without posterior prolongations. 
Habitat . — Off Norway (Ludwig). 
B. Ambulacral Appendages — Pedicels and Conical Papillae. 
Cucumaria versicolor, temper, 1868. 
Body pentangular. Pedicels in five distinct series along the ambulacra, the narrow 
interambulacra being naked. Among the dorsal pedicels, conical ambulacral 
papillae may be found. Eadial pieces of the calcareous ring with two shorter 
