REPORT ON THE CRINOIDEA. 373 
some species of Hudiocrinus which have a succession of very long joints following the 
short basal ones. 
The basals are almost trapezoidal, much wider below than above, and in contact with 
one another by their truncated lower angles (Pl. LVI. figs. 1, 2). The middle of the 
lower edge of each is slightly tubercular. On their narrow upper edges rest the interradials, 
which are oblong and a little higher than wide. Four of them terminate in a free edge at 
the margin of the disk where they are in contact with the lowest anambulacral plates. 
But that on the anal side bears a small tapering appendage of four or five joints, the last 
of which seems to end freely (Pl. LVI. figs. 2, 4, 5). The radials are larger than the 
interradials, and somewhat strongly arched. There is a muscular articulation between 
them and the first brachials; but the union of these to the next joints appears to be by 
ligament only. The arm-joints are long, slender, and cylindrical. One arm seems to be 
broken at the syzygy in the sixth brachial; while another has a syzygy in the fourth 
and again in the eighth brachial. The second brachial bears the first pinnule, which is 
on the right side in three arms and on the left in the other two. The pinnules are very 
delicate, and composed of long slender joints. 
The central portion of the disk is occupied by five relatively large oral plates which 
stand up around the peristome (Pl. LVI. fig. 5); while between them and the margin are 
two or three irregular rows of small anambulacral plates, some of them extending up on 
to the lower part of the long anal tube. The brachial ambulacra are not plated, however, 
and he in the arm-grooves, close down between the muscles, but with no traces of 
sacculi. 
Colour in spirit, dirty white. 
Locality.—Station 158, March 7, 1874; lat. 50° 1’S., long. 123° 4’ E.; 1800 fathoms ; 
Globigerina ooze; bottom temperature, 33°°5 F. One specimen much mutilated and 
probably young. 
