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140 COLLECTIONS FROM MELANESIA.<br />
Lyman, p. 26.<br />
Port MoUe.<br />
11. Ophiocoma scolopendrina.<br />
12. Ophiartlirum elegans.<br />
Peters, Wiegmanri's Arch. 1852, p. 82.<br />
Though the British Museum possesses several specimens of this<br />
species, the present is especially useful, as it is the first which has<br />
come to hand in which even one of the " sehr zerbreehlich " arms<br />
has been preserved entire. As the disk measures 18 millim., and<br />
this complete arm rather more than 120 millim., we find that the<br />
object now in hand presents very much the same proportions as the<br />
specimen described by Dr. Peters. In an example from Torres<br />
Straits, which has been some years in the possession of the Trustees,<br />
there is an arm which is in a sense complete, but it was obviously<br />
broken during life ; and though the disk is of very much the same diameter<br />
as that just added to the collection, this arm only measures<br />
60 millim.<br />
Dr. Coppinger's specimen was collected at Levuka, Fiji.<br />
OPHIOTHRIX.<br />
In addition to the series hereafter mentioned and described,-there<br />
were indications cf other species, not sufficiently good to justify description,<br />
but quite well enough marked to point to the great wealth<br />
of Ojjhiothrvv-iorms in the seas where these dredgings were made.<br />
Lyman, p. 34.<br />
13. OpMothrix fumaria.<br />
As this is a very rare species, the following notes may be of<br />
interest :<br />
—<br />
Eadial shields naked, large, with a curve along their basal edge,<br />
each separated from its fellow by a low ridge on which granules are<br />
generally developed. Each pair of radial shields is separated by some<br />
these granules occupy all but the<br />
seven rows of prominent granules :<br />
very central portion of the disk, and form a spinous patch on the<br />
lower surface. Mouth-shields irregularly oval, pretty sharply angu-<br />
lated proximally and very narrow dis tally, so that the bridge between<br />
the genital slits is very narrow.<br />
the interbrachial space is spinous.<br />
Only the median portion of<br />
Upper arm-plates a good deal encroached upon by the side armplates,<br />
so that, for the greater part of the arm, they are wider along<br />
spine-ridge of side arm-plates<br />
their distal than their proximal edge ;<br />
not specially well developed ; lower arm-plates rectangular, a little
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