REPORT 05^ THE HOLOTHURIOIDEA. 
213 
(Mus. Holm.) Four specimens from Tahiti and one from Marquesas, agreeing in all 
respects with the description of Selenka. The rods are very characteristic, 
commonly more or less curved and finely granulated, often with the ends more 
rough and slightly branched. Even the supporting rods of the pedicels and 
papillae are of the same kind. The number of Pollan vesicles and madreporic 
canals is very variable; thus I counted in one specimen as many as eleven Polian 
vesicles and two free madreporic canals, and in another three to four madreporic 
canals in a bundle. 
Holothiuia pervicax, Selenka, 1867 ; Ludwig, 1883. Holothuria depressa, Ludwig, 1875. 
Holothuria mcimmicidata, Haacke, 1880. 
The ventral pedicels are more crowded than the dorsal papillfe. The tables are not very 
well developed, their spire being often more or less reduced, short, and terminating 
in four simple teeth; the disks are small, rounded, smooth or slightly uneven on 
the margin. The small, more or less elongate rods are characterised by being 
uneven and warted, or distinctly undulated, or deeply incised so as to form a row 
of loops or holes along each side. 
Habitat. — Tahiti, Pelew Islands, and Philippine Islands (Ludwig), Sandwich Islands 
(Selenka), Zanzibar (Selenka), Mauritius (Haacke, Ludwig), Australia, Red Sea, 
and Navigator Islands (Semper). 
(Mus. Holm.) One specimen, 70 mm. long, from the Navigator Islands. Colour in 
alcohol, greyish-ljrown with some darker transverse bands on the back. The pedi- 
cels and papillae are of about the same size. The tables have often a rudimentary 
spire. The rods present examples of transitional forms between simple rods and 
“ buttons.” Pedicels and papillae with numerous, slightly curved rods provided 
with spines. These rods have often a complete or incomplete series of holes 
along one or both sides, or only at the ends. Terminal plates of the papillae 
very rudimentary. 
3. In addition to tables ivith a small ammlar dish or ivith a slightly more 
developed perforated one, fenestrated plates mostly of irregular shape. 
Holothuria atra, Jaeger, 1833 ; Semper, 1868 ; Ludwig, 1881. Holothuria (subgenus 
Microthele) a finis, Brandt, 1835. Holothui'ia foridana, Pourtales, 1851; 
Selenka, 1867. (?) Holothuria radachensis, Cliamisso and Eysenbairdt, 1821. 
The dorsal papillae and ventral pedicels of nearly equal size. Disks of the tables 
forming a simple ring, often with a small hole at the base of each vertical rod ; 
spire terminating in eight horizontal and four vertical, rather long teeth. The 
small fenestrated plates are evenly rounded or undulated on the margin; they are 
often undeveloped, x -shaped with the arms slightly branched. 
Habitat . — Celebes (Jseger), Florida (Pourtales, Selenka), Zanzibar, Java (Selenka), 
