34 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS 32 34
HYPEROBLASTUS SOUTHWORTHI (Reimann) Plate 9, figures 4-6 Pentrerniticlea southworthi REIMANN, 1935, p. 28, pl. 2, figs. 16-17. Description.—The holotype is 8 mm. long by 6 mm. wide, vault 3.5 mm. long, pelvis 4.5 mm. long, pelvic angle 65 degrees. Four hydrospire folds are present on each side <strong>of</strong> an ambulacrum. Occurrence.—Middle Devonian, coral zone <strong>of</strong> Widder beds, Hungry Hollow Formation, tile yard, Thedford, Ontario, Canada. Type.—Holotype, E11,816, Charles Southworth collection, Buffalo Society <strong>of</strong> Natural Sciences, Buffalo, New York. Genus OROPHOCRINUS von Seebach, 1864 [=Codonues MEEK & WORTHEN, 1869; Mitra CUMBERLAND, 1826] BLASTOID STUDIES 35 Type-species, by original designation.—Pentremites stelliformis OWEN & SHUMARD, 1850. Generic diagnosis.—Fissiculate blastoids with ten spiracular slits, into each <strong>of</strong> which four or five hydrospire slits open, anal opening separate between an epideltoid and hypodeltoid plate, lancet exposed along main food groove, with lenticular outer side plates between primary side plates, rarely touching admedial ambulacral margins; sublancet or fused hydrospire plate present, and form conical to club-shaped in side view, Mississippian, Europe and North America. Remarks.—The genus Orophocrinus may have been derived from a form similar to Pleuroschisma, which has closed sinus areas and the cryptodeltoids and superdeltoid fused to form an epideltoid. OROPHOCRINUS STELLIFORMIS (Owen & Shumard) Plate 13, figures 4-9; text-figs. 36-39 Pentrenutes stelliforrnis OWEN & SHUMARD, 1850, p. 67, pl. 7, figs. I 6a-b. Description.—Calyx calcitic, club-shaped in side view, pelvis conical, base flat and wide, summit rounded; FIGURE 35. Hyperoblastus filosus angustus (REimANN), Middle Devonian, Hungry Hollow Formation, near Thedford, Ontario (Buffalo Soc. Nat. Sci., no. E13,055); plate arrangement <strong>of</strong> anal area, drawn from polished tangential section, X34. [Explanation.—An, anal opening; CR, cryptodeltoid; Db, deltoid body; DI, deltoid lip; Ds, deltoid septum; H, hydrospire; HD, hypodeltoid; L, lancet; 0, oral opening; Sp, main side plate; Su, superdeltoid.] strongly pentalobate in top view. Theca 17 mm. long by 19 mm. wide, vault 6 mm., pelvis 11 mm. long, and pelvic angle on radial bodies 70 degrees. Basal circlet 5 mm. long by 8 mm. wide, almost cylindrical, with three normally disposed basals. The stem is large, round, about 3 mm. in diameter, with about 64 crenellae extending radially inward about halfway from the circumference FIGURES 26-34. Species <strong>of</strong> Hyperoblastus FAY, n. gen., Middle Devonian, North America. 26, 27. H. preciosus (REimANN), Hungry Hollow Formation, near Thedford, Ont. (Buffalo Soc. Nat. Sci., holotype, no. E15,934); 26, anal area, X15; 27, main and outer side plates <strong>of</strong> part <strong>of</strong> "B" ambulacrum, X45. 28. H. dotis (REimANNI), Hungry Hollow Formation, Thedford area, Ont. (Buffalo Soc. Nat. Sci., paratype no. E13,052); cross section <strong>of</strong> "E" ambulacrum, X15. 29-33. H. filosus (WHITEAvEs), Hungry Hollow Formation, near Thedford and Arkona, Ont. (Geol. Survey Canada, no. 3,660; Buffalo Soc. Nat. Sci., nos. E13,960, E16,206); 29, anal area (no. 3,660), X15; 30, dorsal view <strong>of</strong> basal circlet (no. 3,660), X15; 31, cross section <strong>of</strong> ambulacrum (no. E16,206), X40; 32, cross section <strong>of</strong> "A" ambulacrum (no. E13,960), X15; 33, main and outer side plates <strong>of</strong> part <strong>of</strong> "C" ambulacrum, X40. 34. H. goldringae (REimANN), Ludlowville Formation, Bay View, N.Y. (Buffalo Soc. Nat. Sci., no. E21,160); cross section <strong>of</strong> "D" ambulacrum, X40. [Explanation.— An, anal opening; Bf, brachiolar facet; Bp, brachiolar pit; C, canal (radial); CR, cryptodeltoid; D1, deltoid lip; H, hydrospire; HD, hypodeltoid; L, lancet; 0, oral opening; OSp, outer side plate; P, pore; Pf, pore furrow; R, radial; RI, radial limb; Sp, main side plate; Su, superdeltoid; Z, azygous basal.]