ECHINODERMATA - KU ScholarWorks - University of Kansas

144 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS
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now in the American Museum of Natural History,
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(753) 1943, Stratigraphy and fauna of the Louisiana
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(754) 1913, The Hamilton formation at Thedford and
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EXPLANATION OF PLATE 53
FIGURE PAGE
1-6. Ambolostoma baileyi PECK, Mississippian. I. Plesiotype,
8,914 (holotype of Pentremites grandis Warren, Geol. Survey
Canada; Rundle Limestone, Cascade Mountain, Alberta;
short ambulacrum showing inner or lower ends of
side plates between lancet and adjacent radial plates
( X5.3). 2, 3. Plesiotype, 8,915 (holotype of Pentremites
perelongatus Warren), Geol. Survey Canada; Rundle
Limestone, Cascade Mountain, Alberta; 2, fragmentary
specimen in dark crystalline limestone showing ambulacrum
with lancet plate removed to reveal hydrospire slits
(X5.6); 3, side view from food groove of impression of
abmedial ends of side plates showing long pores between
plates ( X 5 ).-4-6. Syntypes, 11,762, U.S. Natl. Mus.;
Mississippian, Upper Brazer Limestone, 6 miles west of
Mendon, Utah; 4, ambulacral view showing side plates on
left and lancet on right (X17.6); 5, a smaller specimen,
oral plate on anal side showing large anispiracle adjacent
to deltoid body (outlined in white) ( X15); 6, aboral
view of "A" ambulacrum of specimen shown in fig. 5,
deeply etched with acid, indicating possible outline of three
hydrospire folds on one side of ambulacrum (X24.8) 50