110 
THE VOYAGE OF H.M.S. CHALLENGEE. 
Cucumaria crocea (Holothuria), Lesson, 1830 ; Selenka, 1867. Pentacta crocea, Jaeger, 
1833. Cladodactyla (Polydados) lessonii, Brandt, 1835. Cladodactyla 
crocea, Wyville Thomson, 1877 and 1878. 
Tentacles typical, two ventral smaller. Dorsal pedicels more numerous and several 
times smaller than the ventral. 
Habitat . — Falkland Islands (Lesson, Thomson). 
Allied to Cucumaria frondosa. Compare the above description. 
Cucumaria japonica, Semper, 1868. 
Calcareous ring a lm ost absent, only traces of radial pieces being left. Deposits — irre- 
gular, perforated plates with fine knobs or spines ; larger plates near the anal 
aperture. 
Habitat . — Japan (Semper). 
Even with regard to this species, the arrangement of the dorsal pedicels and the size 
of the tentacles are not fully clear. Senaper states that it is closely allied to 
Cucumaria frondosa. 
II. Pedicels present in the ambulacra, and also scattered all over the 
interambulacra or over some of them. 
1 . Pedicels arranged in double rows along the Jive ambulacra; besides, scattered 
ones on the dorsal interambulacra, whereby the dorsal rows become more or 
less indistinct. 
Cucumaria frondosa [Holothuria), Gunnerus, 1767; Forbes, 1841; Duncan and 
Sladen, 1881. Holothuria pentactes, 0. F. Muller, 1806. Pentacta frondosa, 
Jaeger, 1833. Cuvieria frondosa, Blainville, 1834. (?) Cladodactyla pentactes, 
Brandt, 1835. (?) Cucumaria fucicola, Forbes, 1841. Botryodactyla grandis, 
Ayres, 1854 and 1873. Botryodactyla affinis, Ayres, 1854. 
Body ovate. Tentacles nearly equal. A quadruple disposition of the pedicels in the 
middle of the ambulacra common in old individuals; a few pedicels scattered 
over the dorsal interambulacra. Deposits — irregular smooth simple perforated 
plates. Some specimens, especially the larger, are almost devoid of deposits, 
while others are more or less richly provided with plates. Generally the plates 
are more frequent in, or in the neighbourhood of the ambulacra. . Calcareous ring 
not very well developed. 
Habitat . — Greenland (Liitken, Norman, Duncan and Sladen, Ludwig, Stimpson, &c.), 
Spitzbergen (Liitken, Ljungman), Thousand Islands in the Arctic Sea (Heuglin), 
off Beeren Island (Danielssen and Koren), Iceland (Liitken, Ludwig), west coast 
of Scandinavia from Finmark to Kattegat (Diiben and Koren, M Andrew 
