ANNOTATED LIST. 167 
KOLOSTONEURA. 
Genotype: Rhabdomolgus nove-zealandie Dendy and Hindle. Monotypic. 
As suggested above (p. 165), Rhabdomolgus nove-zealandie Dendy and Hindle has 
little in common with Rhabdomolgus ruber, except the number of tentacles and the absence 
of calcareous particles in the body-wall. The tentacles show beyond question that it is 
one of the Chiridotine, while it is equally sure that R. ruber is a true synaptid. Under 
such conditions it is obvious that the New Zealand species must either be placed in Achiri- 
dota or become the type of a new genus. The number of tentacles suggests a near relation- 
ship to Trochodota, while the character of the calcareous ring is very different from that of 
Achiridota, and it seems that a phylogenetic classification is more nearly secured by the 
establishment of the new genus. This step has already been taken by Becher (1909). 
CUCUMARIIDEE. 
Cucumaria semperi. 
Bell. 1884. Alert Rep., p. 147, pl. ix, fig. A. 
The localities given for this species are Port Denison and ‘‘Torres Straits.”” Vaney 
(1912) records it from the Aru Islands, but unfortunately without a word of comment. 
We found no Cucumarias anywhere in Torres Strait. 
Thyone buccalis. 
Stimpson. 1856. Proc. Acad. Nat. Sci. Phila., 7, p. 386. 
The type locality for this Thyone is Port Jackson, but it has been taken at several 
stations along the Queensland coast, and its occurrence in Torres Strait is therefore not 
strange. We found a single specimen under a rock on the flat southwest of Friday Island, 
September 13, 1913. The color in life is dull purple. 
Thyone okeni. 
Bell. 1884. Alert Rep., p. 149, pl. ix, fig. D. 
Oddly enough, the type locality for this holothurian is also Port Jackson, but, unlike 
the preceding species, it does not seem to have been met with since the original description. 
It is therefore a matter of considerable interest that we took on Madge Reef, near Thurs- 
day Island, an excellent example of okeni. It was found closely attached by the pedicels 
to the under side of a rock-fragment; the pedicels, not thus used, held most tenaciously 
to sand-grains, bits of shell, ete., quite effectively concealing the whole animal. The color 
in life was brownish, the pedicels with a distinctly reddish tint. The change of shape in 
preservation is very striking; in life, the dorso-ventral diameter of the body was 0.40 of 
the body-length, and both mouth and anus were close to the dorsal side; after preserva- 
tion, the body became a nearly cylindrical tube whose diameter is scarcely 0.15 of the 
length; the mouth and anus are terminal. 
Thyone papuensis. 
Thyone fusus var. papuensis Théel. 1886. Challenger Req., p- 92, pl. vii, fig. 1. 
A single specimen of this Thyone was taken by the Challenger in 8 fathoms in Torres 
Strait. It is rather odd that of three Thyones known to have been taken in Torres Strait, 
each represents a distinct species. Théel considered the Challenger Thyone as so nearly 
identical with the Scandinavian species fusus that he gives it only a varietal name, but the 
differences he points out seem to me sufficient to warrant its recognition as a species, 
especially since fusus is not known from any other place in the Indo-Pacific region. Pearson 
(1903) has reported papuensis from Ceylon. 
