. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 256 ECHINODERMA TA. [ KlO. 342.—Hyhocy- stites probleinaticiis. Hybocystites, Wetherby, 1880, Jour. Cin. Soc. Nat. Hist., vol. 3, p. 150. [Ety. hubo», liumpbacked; kmtis, bladder.] Calyx like Hybocrinus, and order of arrangement of the two serits of plates is tlie same, but dis- tinguished by hav- ing three arm-like projections, and two or more recumbent arms with ambula- cral opening central; from the
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 256 ECHINODERMA TA. [ KlO. 342.—Hyhocy- stites probleinaticiis. Hybocystites, Wetherby, 1880, Jour. Cin. Soc. Nat. Hist., vol. 3, p. 150. [Ety. hubo», liumpbacked; kmtis, bladder.] Calyx like Hybocrinus, and order of arrangement of the two serits of plates is tlie same, but dis- tinguished by hav- ing three arm-like projections, and two or more recumbent arms with ambula- cral opening central; from the peristome, the five ambulacra diverge; three are directed to the arm- like projections, and are supposed to pass over the top of them and extend down- ward upon the exterior; valvular open- ing between the upper azygous plate and the mouth. Type II. problematicus. problematicus, Wetherby, 1«80, Jour. Cin. Soc. Nat. Hist., , p. 150, Tren- ton Gr. Hydkkionohrinus, DeKoninck, 1858, Bull. Acad. Royale Belgique, vol. 8, pt. 2, p. 13. [Ety. hydreion, water-bucket; hri- non, lily.] Calyx short, rounded be- low ; basals 5; subradials 5; radials 1x5; brachials 1 x 4 -f 2 x 1; arms as in Zeacrinus, and pinnules short; distin- guished from Zeacrinus by the ventral sac, which extends beyond the arms and covers them like a roof; the upper plates are convex or spinous; respira- tory pores in the sutures of the cylin- drical part of the sac, which is covered, by the arms. Type H. woodanus. acanthophorus. Meek & Worthen, 1870, (Zeacrinus acanthophorus,) Proc. Acad. Nat. Sci. Phil., p. 28, and Geo. Sur. 111., vol. 5, p. 563, Up. Coal Meas. armiger, Meek & Worthen, 1870, (Zea- crinus armiger,) Proc. Acad. Nat. Sci. Phil., p. 27, and Geo. Sur. 111., vol. 5, p. 547, Kaskaskia Gr. depressus, Troost, as defined by Hall, 1858, (Zeacrinus depressus,) (zee. Sur. Iowa, p. 546, Kaskaskia Gr. discus. Meek & Worthen, 1860, (Zeacri- nus discus,) Proc Acad. Nat. Sci. Phil., p. 39, and
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