2 I 7 
2. Pseudocladochonus versluysi n. sp. (Plate II, Fig. 7; Plate XXV, Figs. 9a and 9b). 
Stat. 144. Damar-Island. 45 M. Coral bottom and Lithothamnion. 1 Ex. and fragments. 
The specimens of this very interesting form have the following dimensions. The largest 
seems to be a nearly complete colony, 2.1 cm. high, with a maximum breadth of 2.5 mm. It 
has two broken branches and four calyces of its own. Two other pieces, the tips of a colony 
or colonies, show a stem breadth of 2 mm., and a calyx breadth of 2.5 mm. The colour is 
warm cream at the base, and passes gradually into rosy pink. The pieces are quite rigid, but 
readily broken. With a lens, the texture of the surface is seen to be rough, with longitudinally 
disposed spindles fitting closely. 
The specimens differ from those so carefully described by Versluys in the following respects : 
Ps. versluysi n. sp. 
Ps. hicksoni Versluys. 
a. Colour, cream to rose. 
b. Much more robust in build, the calyces having a breadth 
of 2.5 mm., the stem less. 
c. The polyps do not show a zig-zag arrangement, but 
are close together at the end of the larger specimen. 
d. The spicules of the general cortex and calyx are large 
rough spindles without forking. A few show an acute, 
not spreading, bifurcation at one end. Their breadth is 
on an average 0.3 mm. 
The spindles of the cortex are extremely rough, entirely 
covered with warts and prominences. In many cases one 
side of the spindle shows longer smooth prominences, 
while the other side is covered with small compound 
warts. A spindle often passes towards a pseudo-club, 
gradually tapering from an acute to an obtuse end. 
On the calyx there are derivatives of the spindle type 
with an asymmetrical irregular expansion at the broad end. 
e. The compound warts of the spindles fit closely into 
one another, but there is no fusion. 
f. The largest tentacular sclerites — flat spindles with 
one end forked or expanded — reach a length of 0.3 mm. 
There are also quite simple tentacular spindles. 
a. Colour white. 
b. Calyces with a breadth of 1 mm., 
the stem less. 
c. The polyps are very markedly 
alternate, producing a zig-zag ap¬ 
pearance. 
d. The spicules are characteristic rods, 
forked or branched at their ends. 
A common breadth is 0.15 mm. 
e. There is actual coalescence of the 
forked rods. 
f. The largest tentacular spindles — 
flat needles sometimes forked ter¬ 
minally — are 0.18—0.22 mm. 
A Fragment like Pseudocladochonus. 
o 
Stat. 144. Damar-island. 45 M. Coral bottom and Lithothamnion. 
An interesting fragment, suggestive of Pseudocladochonus, was too minute to allow of 
satisfactory examination. It is Telestid-like in its tubular character, but there is no indication of 
SIBOGA-EXPEDITIE XIII d. 
28 
