212 
THE YOYAGE OF H.M.S. CHALLENGEE. 
2. In addition to tables with a simple annular dish or with a more or less 
well-developed perforated one, simple or branched rods hut no plates. 
Holothuria tremula, Gunner, 1767 ; Diiben and Keren, 1844; Selenka, 1867. Holo- 
thuria elegans, 0. F. Muller, 1788-1806. Fistularia elegans, Lamarck, 181.5- 
1822. Holothuria (subgenus Thelenotd) elegans, Brandt, 1835. 
The dorsal papillae are conical, while the ventral have a more cylindrical or conico- 
cyhndrical appearance. Disks of the tables well developed, rarely or never 
smooth on the margin, but mostly spinous or angular, and pierced with a 
varying number of rather large angular holes ; the spire terminates in numerous 
teeth arranged in two crowns. The rods are of two kinds — solid, simple or 
branched, more or less spinous ; and delicate, slender, spinous branched ones. 
'Habitat . — Coast of Scandinavia, from the Cattegat to Drontheim (Sars, Diiben and 
Keren, Danielssen and Keren, 0. F. Miiller, Ludwig, Mobius and Biitschli), 
between Norway and Shetland (Hoffmann), Bay of Biscay (Norman). 
(Mus. Holm.) A very great number of specimens from Sweden and Norway. The 
red colour vanishes in alcohol, but the minute dark dots remain especially on 
the dorsal surface. Mouth surrounded by a distinct crown of papillae arranged 
in about two circles. The dorsal conical papillae have broad bases. The ventral 
cylindrical appendages have distinct sucking-disks and terminal plates, much 
larger than those of the dorsal papillae, and they may be regarded as pedicels 
rather than as true papillae. Sometimes they are more closely placed on the 
three ventral ambulacra, and sometimes they seem to be smaller on the odd 
ambulacrum. The tables do not at all resemble the figure drawn by Selenka, 
but the drawings of Diiben and Keren give a better idea of their tnie shape. 
The perforated disks are very delicate, and the numerous teeth on the top of 
the spire form two crowns, the lower of which is situated just at the transverse 
beam, and contains eight to twelve teeth ; the higher placed crown, forming 
the top itself of the spire, has about sixteen teeth or more. The simple or 
branched rods are not equally distributed all over the body ; they seem always 
to be present in the neighbourhood of the ambulacral appendages. 
Holothuria pulchella, Selenka, 1867 ; Ludwig, 1881. Stichopus (subgenus Gymno- 
chirota) cinerascens, Brandt, 1835. 
The ventral pedicels are much more crowded than the small dorsal papillae. The spire 
of the tables is supported by a reduced almost annular disk, and carries twelve teeth 
on the top. The rods are slightly curved and finely granulated. 
Habitat . — Sandwich Islands (Selenka), Philippine Islands (Semper), Sunda Islands and 
Java (Semper), Mozambique (Semper), Tahiti, Batjan, and Navigator Islands 
(Semper), Boninsima (Brandt), Enosima (von Marenzeller), Mauritius (Haacke, 
Ludwig). 
