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Thuiaria robusta, S. F. Clarke.
Pl. 19, fig. 17. Pl. 21, fig. 25.
Tliis species, described by Clarke from Bering Strait and
adjacent parts of the Arctic Ocean, occurs in the Vega
c-ol-lection from long. 119° E.
It is a shorter, stouter and more bushy species than
T. plumosa. The gonangia are quite different in shape: those
of T. robusta being short and conical with long pointed horns,
while those of T. plumosa are long and narrow, with the horns
reduc-ed to short processes. In this respect, and also in the
narrower and rnore distinctly bilabiate hydrothecse, and in
general habit, T. plumosa verges towards T. (S.) cupressina,
T. robusta similarly towards T. argentea.
Th uiaria VegaB, n. sp.
Pl. 20, fig. 18, 20, 21, 22.
Slioots slender, upright, t aper ing: branches close and numerous,
somewhat spirally arranged, and leaving no bare region in the loteer
part of the stem: branches pinnate, directed upwards, cmd lying close
to the stem; hydrothecce subalternate, tubular, adherent for half tlieir
length or rather more, divergent above: aperture small, indistinctly
bilabiate; gonothecce broad above, tapering below, with a short sharp
liorn above at each side, cmd a central aperture raised, marginate,
and with the margin encircled by small teeth.
This apparently new form occurs from two stations, both
of them shallow-water, viz. in long. 142° 36’ and 144° 20’ E.
It is a small species, about 4 inches in heiglit, but the
hydrothecse are exceptionally large, being not far from twice
as big as those of T. (S.) cupressina.
The closeness and upright growth of the branches give
the zoophyte a bushy appearance. The subspiral arrangement,
branching, and the form of both hydrothecse and gonangia
bring it into relation with the group to which T. plumosa, and
T. robusta belong, but it differs markedly from these in its
distinctly pinnate branches.
The hydrothetfe of all three species are slightly different
one from another. Those of T. Vegce are the largest, the most
divergent above, the most bulging below, and the least
distinctly bilabiate. In both T. plumosa and T. robusta, the
hydro-thecee are adjacent to the stem for nearly their whole length,
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