ECHINODERMATA - KU ScholarWorks - University of Kansas

70 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
deltoid is adjacent to the oral opening and has two septa
that separate the anal opening from the adjacent hydrospire
canals internally. The two cryptodeltoids adjoin the
septa internally and form broad platforms adjacent to
the "C" and "D" radial limbs. The "C" radial limb continues
adorally beyond the "D" limb, and the irregularly
pentagonal hypodeltoid fits against the adorai ends of
the "C" and "E" radial limbs, overlapping the cryptodeltoids.
Thus, there are five spiracles around the oral
opening, comprising four spiracles and anispiracle. There
FIGURES 133-137. Eleutherocrinus cassedayi SHUMARD & YANDELL, Middle Devonian, Hungry Hollow Formation,
Thedford, Ontario (Buffalo Soc. Nat. Sci., nos. E13,061, E15,933).
133. Summit area and parts of "BC" and "CD" interambulacra,
and "D" ambulacrum (no. E15,933), X15.
134. Oblique cross section of "E" ambulacrum (no.
E13,061), X15. 135. Partial cross section of "D"
ambulacrum, aboral view (no. E13,061), X15. 136.
Aboral view of an ambulacrum near aboral end (no.
E13,061), X15. 137. Part of ambulacrum showing
side plates (no. 13,061), X45. [Explanation.—"A," amb.;
An, anal opening; Bf, brachiolar facet; Bp, brachiolar pit;
C, canal (radial); CR, cryptodeltoid; D, deltoid; Db, deltoid
body; Dc, deltoid crest; D1, deltoid lip; Ds, deltoid
septum; H, hydrospire; HD, hypodeltoid; L, lancet; 0,
oral opening; OSp, outer side plate; P, pore; Pf, pore furrow;
R, radial; RI, radial lip; S, spiracle; Sp, main side
plate; Su, superdeltoid.]