fiz, 11); and when this ridge is large it shows itself very plainly in a terminal view of
the joint-face, outside the line of teeth (compare Pl, XXXIX, figs. 8 and 11). In this
specimen too the downward extension of the basals over the upper stem-joints is
especially well marked, and the supra-nodal joint is rather more hollowed to receive
the cirrus-bases than it is in the type. The stems of five specimens all terminate below
in a nodal joint. In two cases there appears to have been an attached portion of stem ~
beneath ; for the surface of this lowest nodal joint is comparatively fresh and its central
canal visible; but in the other three stems this surface is somewhat worn, and I cannot
make out the opening of the central canal, which appears to have been closed up, the
animal living in a semi-free condition like Pentacrinus wyville-thomsoni, Pentacrinus
maclearanus, or Pentacrinus alternicirrus. The respective lengths of these stems are
as follows :—(1) 38°5 cm. long, closed at the thirty-fifth node; (2) 23°5 em. long, closed


REPORT ON THE CRINOIDEA. 347


at the twenty-fourth node; (3) 22°5 em. long, closed at the twenty-fifth node. The
individuals of this species present various forms of monstrosity, some of which have
already been mentioned :—(1) The presence of six joints in one ray, of which the second
and the axillary are syzygies, thus approaching the other group of Metacrinus species.
