ECHINODERMATA - KU ScholarWorks - University of Kansas

80 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
periphery well above mid-height at radial lips. The stem
impression appears to be round, 0.75 mm. in diameter, in
slight concavity. Basal circlet short, flattened conical in
side view, trangular in basal view, 3 mm. long by 3 mm.
wide, with flat triangular aboral base each side of which
is 1.5 mm. wide. Radials fi ve, hexagonal in side view,
each 8.5 mm. long by 2.5 mm. wide, with short, wide,
deep sinus 3 mm. long by 1.75 mm. wide by 0.5 mm.
deep, with limbs shorter on anal side than on other sides;
radials overlapping deltoids. Radials and basais flare.
Deltoids four, short, triangular, barely visible in side
view, each 1.5 mm. long by 1 mm. wide, with a paired
spiracle at adorai ends of each. On the anal side there
are four deltoid plates—a superdeltoid adjacent to the
oral opening, homologous with the deltoid lip of each
of the other four deltoids, two cryptodeltoids resting on
the aboral surface of the superdeltoid, internally separating
the anal opening from the adjacent hydrospire canals,
and a hypodeltoid that covers the cryptodeltoids and abuts
against the adjacent radial limbs. A paired anispiracle
is present on the anal side; thus five paired spiracles occur
around the oral opening, that is, four paired spiracles and
a paired anispiracle.
Ambulacra five, short, linear, each 4 mm. long by 1
mm. wide, with lancet covered by side plates, and 40
side plates in space of 10 mm. along an ambulacrum. Side
plates not well preserved but appearing to be normally
arranged. Surfaces of calyx plates ornamented by fine
growth lines subparallel to plate margins.
Occurrence.—Upper Mississippian, Salem Limestone,
Lanesville, Indiana.
Types.—Syntypes, 6,284, two specimens, Gurley collection,
Walker Museum, University of Chicago.
METABLASTUS VARSOUVIENSIS (Worthen)
Plate 19, figure 9; plate 50, figures 1-3; plate 52, figure 6
Pentremites (Tricoelocrinus) varsotsviensis MEEK 8c WORTHEN, 1875,
p.521, pl. 31, figs. 8-9.
Description.—The types are fragmentary. The small
syntype is 11.5 mm. long by 6 mm. wide, with vault 6.5
mm. long, pelvis 5 mm. long, and pelvic angle 65 degrees.
The large syntype is 15 mm. long by 9 mm. wide, with
basals destroyed. The above proportions serve to distinguish
this species from all others. Radial bodies and
basais slightly flared.
Occurrence.—Upper Mississippian, Warsaw beds,
Monroe County, Illinois.
Types.—Syntypes, 1,885 (old no. of the Illinois State
Museum), two specimens, Worthen collection, Illinois
Geological Survey, Urbana.
METABLASTUS WACHSMUTHI (Gurley)
Plate 51, figures 1-2,5
Troostocrinus wachsmathi GURLEY, 1884, p. 1.
Description.—Calyx calcitic, poorly preserved, bipyramidal
in side view, 42 mm. long by 16 min. wide, with
vault 13.5 mm. long, pelvis 28.5 mm. long, pelvic angle
25 degrees, periphery at radial lips above mid-height, and
with flat wide triangular base 5 mm. wide on each side.
Stem impression not well preserved. Basal circlet long,
flattened basally, conical in side view, pentagonal in basal
view at basiradial sutures, gradually tapering to an equilateral
triangle at base. Radials five, long, hexagonal in
side view, each 28 mm. long by 8.5 mm. wide, with short,
wide, deep sinus 12 mm. long by 4 mm. wide by 2 mm.
deep; radials overlapping deltoids. Radial bodies and
basais slightly flaring.
Deltoids four, short, not visible in side view, triangular,
each 4 mm. long by 2 mm. wide, with adorai tips
notched by a V-shaped paired spiracle. On the anal side
are four anal deltoids, a superdeltoid, two cryptodeltoids,
and a hypodeltoid. The short, wide, curved superdeltoid
is adjacent to the oral opening, overlapped on its aboral
surface by the two cryptodeltoids which internally separate
the anal opening from the adjacent hydrospire
canals. The pentagonal hypodeltoid is missing but the
facets for its reception are present. The adorai ends of the
radial limbs on the anal side overlap the cryptodeltoids,
and the hypodeltoid covers the cryptodeltoids on the
EXPLANATION OF PLATE 25
FIGURE PAGE
1-12. Devonoblastns whiteavesi REIMANN, Middle Devonian,
Hungry Hollow Formation (coral zone) Ontario, (except
fig. 6).—1 3, 7. Topotype, 35,036, Charles Southworth
coll. Univ. Michigan; Hungry Hollow of Ausable River
Valley, 2.5 miles northeast of Arkona, Ontario; 1-3, oral,
"D" ambulacral, aboral views (X4.6); 7, detail oral view
of same specimen ( X 17).-4. Plesiotype, 34,467,
Charles Southworth coll. Univ. Michigan; tileyard about
0.5 mile north of Thedford, Ontario; oral view of polished
summit showing anal opening (black) with cryptodeltoids
on either side and superdeltoid on adorai side ( X13.2).
—5,9. Plesiotype, E13,065, Charles Southworth coll.
Buffalo Soc. Nat. Sci.; near Thedford, Ontario; 5, hydrospires
from interior side ( X8); 9, aboral view of thin
section with "E" ambulacrum directed upward (X8.2).
—6. Plesiotype, (accession no.) 142,025, U.S. Natl.
Mus.; Middle Devonian, Tichenor Limestone (shaly layer),
Cazenovia Creek, Springbrook, Erie County, New York;
detail ambulacral view (X11). 8. Plesiotype, S4,648,
Springer coll., U.S. Natl. Mus.; Ausable River area, 2 miles
east of Arkona, Ontario; oral view of polished section
with "C" ambulacrum directed downward ( X5.6).—
10-12. Plesiotype, S4,144, Springer coll., U.S. Natl. Mus.;
Marsh's Mill, Arkona, Ontario; aboral, "D" ambulacral,
oral views (X4.4) 52