610 Proceedings of the Roycd Society 
dredged in six fathoms, on mud and shell gravel. Body, some- 
what pentagonal, of a pale-flesh colour, here and there slightly 
grained with red ; having regular markings, roughly granulated, 
and with the margins modified so as to fit the bases of the five 
rays. The first joint of each of the latter is nearly plano-concave, 
minutely grained and frosted (in spirit). Between this and the 
body is a biconvex, ligamentous connection. The next joint is 
somewhat lozenge-shaped, presenting a central projection, and two 
slightly curved articular surfaces to the first joint, and a longer 
process and two more extensive articular surfaces (also curved) on 
the distal side, each of the latter articulating with a division of 
the bifid arm beyond. Viewed dorsally, it has thus no less than 
four articular ligaments. The limbs usually separated at the joint 
between this and the first segment. A transverse section of an 
arm at its base showed aborally an arched outline, orally a flat- 
tened, so that it was somewhat D-shaped, with a perforation in 
the centre. Two symmetrical muscular bundles were placed over 
each of the larger joints inferiorly. The first joint of the secondary 
arm is of an irregular rhomboidal shape, being widest towards its 
outer edge, and with the deepest curve on its proximal side; the 
second, of an irregular lozenge-shape, pointed on both proximal 
and distal edges, especially the latter^ the distal apex being on the 
outer side of the middle line, the short outer curve thus formed 
giving rise to the long, jointed limb. The last joint presents a 
somewhat plano-concave outline on its dorsal surface, the concavity 
being proximal, and articulating by means of a biconvex ligament 
with the preceding segment. From the outer side and shorter 
curve of the second last segment springs, as before mentioned, a 
long, delicate, jointed arm of ten gradually diminishing pieces, 
like the skeleton of a vertebrate tail. The segments of these are 
(in spirit) finely grained, and frosted (after the manner of several 
Lepralise), like the larger segments, and have also microscopic spikes 
near the junctions, directed distally. Along the ventral surface of 
these slender armlets, after preservation in spirit (which blanched 
the rest), were numerous dull, reddish, minute tubercles, apparently 
imbedded in the tough membrane that was present on this surface. 
All the arms and their branches were coloured, during life, of a beau- 
tiful purple lake, a slightly paler portion being in the centre dorsally. 
