. Bulletins of American paleontology. . C B n 0 0 0 0 0 0 tocrmus became much larger than Pariocriinis and sexual maturity probably occurred later in life. Etymology of name.—hapto (Gr.) = to fasten or bind; a reference to the fixed primibrachials of this genus + kriiion (Gr.) = lily. Haptocrinus calvatus, new species Plate 1, figures 1, 2, 9-12, 19, 20, 22, 25; Plate 2, figures 10-14 Text-figures 15A-D Hall, , p. ISO, pi. A 41, figs. 3a-g (par- timj. Diagnosis.—As for the genus. Cup plates smooth, unornamented. Column long, xenomorphic, pentamer- ic, strong
. Bulletins of American paleontology. . C B n 0 0 0 0 0 0 tocrmus became much larger than Pariocriinis and sexual maturity probably occurred later in life. Etymology of name.—hapto (Gr.) = to fasten or bind; a reference to the fixed primibrachials of this genus + kriiion (Gr.) = lily. Haptocrinus calvatus, new species Plate 1, figures 1, 2, 9-12, 19, 20, 22, 25; Plate 2, figures 10-14 Text-figures 15A-D Hall, , p. ISO, pi. A 41, figs. 3a-g (par- timj. Diagnosis.—As for the genus. Cup plates smooth, unornamented. Column long, xenomorphic, pentamer- ic, strongly pentalobate throughout most of its length, tapering almost to a point distally. Description.—Cup lekythosiform (high conical), cylindrical, or slightly barrel-shaped, higher than wide (h/w = ), diameter equal to or slightly exceed- ing that of proximal column. Cup consisting of four circlets of smooth, unornamented plates (basals, radi- als, first and second primibrachials). Basal, radial, and combined primibrachial circlets each comprising ap- proximatelyone-third of cup height (Table 4). Basals approximately pentagonal, h/w ratios variable ( ), lower margins extending obliquely downward to- ward pentamere junctions. Basals greatly thickened proximally; diameter of cicatrix approximately 15% that of base of cup (Text-fig. 15D). C ray radial com- pound, remaining radials undivided. A, B, and E ray radials approximately pentagonal, wider than high to slightly higher than wide (h/w = ); height to distal margins not varying more than 10% between rays, corners higher than distal margins of adjoining radials truncated. B and D ray radials six-sided, sub- equal (h/w = ). constricting slightly next to C ray superradial. C ray radial divided equally into in- ferradial and supenadial. Inferradial situated below truncated distal corners of B and D ray radials. Infer- radial five-sided, wider than high (h/w = ), contracting slightly in width dis
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