. Bulletins of American paleontology. 50 Bulletin 360. Text-figure 19.—Dendrocrinus aphelos n. sp., plate diagram of cup of BMS E26367. Radials black. Scale is I mm. E R height = ; RA height =, width =; anal X height = width = Etymology of name.—ursa (L.) = bear; the specific epithet refers to the name of the type locality. Bear Creek. Dendrocrinus aphelos, new species Plate 7, figures 1, 13; Text-figure 19 Diagnosis.—A large, robust species of Dendrocri- nus characterized by smooth, unomamented cup, ele- vated radial facets, arms branching on the seventh to ninth primibrach
. Bulletins of American paleontology. 50 Bulletin 360. Text-figure 19.—Dendrocrinus aphelos n. sp., plate diagram of cup of BMS E26367. Radials black. Scale is I mm. E R height = ; RA height =, width =; anal X height = width = Etymology of name.—ursa (L.) = bear; the specific epithet refers to the name of the type locality. Bear Creek. Dendrocrinus aphelos, new species Plate 7, figures 1, 13; Text-figure 19 Diagnosis.—A large, robust species of Dendrocri- nus characterized by smooth, unomamented cup, ele- vated radial facets, arms branching on the seventh to ninth primibrachial, plicate anal sac, and transversely round, xenomorphic column composed of thin col- umnals with partly fused pentameres. Description.—Cup conical, height equal to width, cicatrix wide. Cup plates smooth, unomamented. In- frabasal, basal, and radial circlets comprising, respec- tively, approximately 25%, 35%, and 40% of cup height. Infrabasals five, pentagonal, typically wider than high (h/w = ). Basals five, height and width similar (h/w = ). CD interray basal hep- tagonal, remaining basals hexagonal. Radianal situated directly under C ray radial, pentagonal, wider than high (h/w = ). Radials five-sided, C ray radial smaller than radianal and other radials, wider than high (h/w = ), remaining radials higher than wide (h/w = ). Radial facets U-shaped, narrow, occupying not more than 45% width of radials. Each radial facet has a narrow, deep, V-shaped ventral groove (PI. 7, fig. 13). Anal X large, six-sided, slightly wider than high, supporting a small anal plate to upper left and larger, pentagonal X, directly above. X, incorporated into cup, distal margin slightly above adjoining radial facets. Anal sac large, consisting of six rows of plicate, wedge-shaped to roughly rectangular plates each with three to five laterally directed ridges. Distal portion of anal tube unknown. Arms five, robust, isotomous, successive divisions occurring on sev
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