ECHINODERMATA - KU ScholarWorks - University of Kansas

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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.]
BLASTOID STUDIES 71 140 141 138 142 143 139 FIGURES 138-143. Species of Ellipticoblastus FAY, Globoblastus HAMBACH, and Granatocrinus HALL, Lower Carboniferous, England, and Mississippian, North America. 138. Ellipticoblastus orbicularis (SowExalt), Lower Carboniferous, England (Univ. Chicago, no. 13,877); summit area, X15. 139-142. Globoblastus norwoodi (OwEN & SHUMARD ), Lower Mississippian, Burlington Limestone, Burlington, Iowa (U.S. Natl. Mus., nos. S4,955, S4,956); 139, anal area (no. S4,956), X17.5; 140, basal area, showing stem impression (no. S4,956), X40; 141, cross section of "E" ambulacrum, aboral view (no. S4,955), X20; 142, part of ambulacrum, showing side plates (no. S4,956), X20. 143. Granatocrinus kentuckyensis (CoNiuN), Lower Mississippian, New Providence Formation, Jefferson County, Kentucky (U.S. Natl. Mus., paratype 1, no. 139,620); anal area, X15. [Explanation.—"A," amb.; An, anal opening; Bp, brachiolar pit; "C," amb.; C, canal (radial); CR, cryptodeltoid; "D," amb.; D, deltoid; D1, deltoid lip; ED, epideltoid; H, hydrospire; HD, hypodeltoid; HP, hydrospire plate; L, lancet 0, oral opening OSp, outer side plate; P, pore; Pf, pore furrow; R, radial; RI, radial limb; S, spiracle; Sp, main side plate; Su, superdeltoid; Z, azygous basal.]
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