428 Prof. F. J. Bell on a new Species of Antedon. 
The following appear to be the diagnostic characters of 
this new species, which may be called 
Antedon emendatri«. 
An Antedon of the “ palmata-group” of P. H. Carpenter, 
in which the disk is exceedingly small; the centro-dorsal, 
which is coextensive with its aboral surface, has about 
twenty-two pits, and the cirri have about twenty-five joints ; 
the second half or distal set of these joints are spiny. The 
arms are little more than ten in number or may be more than 
twenty ; the third brachial has a pinnule ; the second pinnule 
is larger than the third; the rays are free laterally; the 
second pinnule is stiff and styliform, has about twenty joints, 
most of which have their distal edge projecting and serrated ; 
the radials, distichals, and most prominent brachials have 
marginal projections which are not very prominent ; the third 
pinnule is only half as long as the second ; the third radial 
is very little longer than the second. The third brachial is 
a syzygy, and there is not another till the twenty-fifth joint. 
Colour purple-madder, the pinnules grey. 
Spread about 150 millim.; diameter of disk 6 millim. 
Hab, Mauritius. 
This is really a very interesting species, inasmuch as the 
comparatively large number (twenty) of joints in the second 
pinnule makes it intermediate between Dr. Carpenter’s set 
(p. 225) of forms in which the second pinnule has from twelve 
to eighteen much elongated joints and that in which the same 
pinnule has twenty-five or more joints which are not specially 
elongated. It has many points of resemblance to A. indica, 
but its spinose cirri, its second pinnule, and its rare syzygies are 
sufficient to distinguish it. An examination of Mr. Smith’s 
type of A. zndica shows that in that species the rays have 
marginal projections, It would be instructive to get a large 
series of specimens of that species, of A. spicata and A. 
tuberculata. At present we are in the stage of making species 
of Antedon, and we must continue to do so till we have larger 
and finer series before us. Then another part of our work 
will begin ! 
EXPLANATION OF PLATE XVIII, 
Fig. 1. Antedon emendatriv ; general view from the side. Nat. size. 
Fig. 2. Portion of disk and arms. X 3. 
Fig. 3. Portion of arm after last axillary. x 2, 
Fig. 4. Second pinnule. xX 4. 
