ECHINODERMATA - KU ScholarWorks - University of Kansas

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BLASTOID STUDIES 129
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EXPLANATION OF PLATE 48
FIGURE PAGE
1-12. Diploblastus glaber (MEEK & WORTHEN), Mississippian,
Meramecian Series.-1 3. Plesiotypes, 1,303, Univ.
Kentucky. Ste. Genevieve Limestone, Crittenden County,
Ky.; oral, "D" ambulacral, aboral views, with azygous
basal in "DE" interambulacrum (all X13).-4-6.
Plesiotype, E1,498, Worthen coll., Univ. Illinois, labelled
Mesoblastus kirkwoodense; St. Louis Group, Brown County,
Ill.; oral, "C" ambulacral, aboral views of specimen
that may not belong to this species (notice large side plates
and rounded outline in top and side views) (all X14.3).
7-12. Syntypes, X-363, A. H. Worthen coll., Univ.
Illinois; St. Louis Group, Hardin County, Ill.; 7-9, oral,
"DE" composite ambulacral, aboral views of abnormal
specimen in which "D" and "E" ambulacra are coalesced
( X7.3); 10-12, oral, "D" ambulacral, aboral views of
complete specimen showing quadrangular outline in side
view and pentagonal outline in top view, with flat basal
circlet (compare with above specimens that probably should
be classed as distinct species) ( X8.8) 64