40 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS Genus PHAENOBLASTUS Fay, n.gen. Type-species, by original designation (herein).—Pentremites caryophyllatus DEKONINCK, 1854. Generic diagnosis.—Fissiculate blastoids with ten hydrospire fields (mostly hidden), an epideltoid and hypodeltoid, with a reduced number <strong>of</strong> hydrospire slits on the anal side, lancet plate completely exposed; calyx club-shaped in side view. Lower Carboniferous, Belgium. Remarks.—The genus Phaenoblastus was probably derived from Phaenoschisma by the outward migration <strong>of</strong> the lancet plate, and Phaenoschisma was probably derived from Deltoschisma by fusion <strong>of</strong> the cryptodeltoids and superdeltoid into an epideltoid. PHAENOBLASTUS CARYOPHYLLATUS (de Koninck & Lehon) Plate 14, figures 2-3, 5-6, 8, 10; text-figs. 46-48 Pentremites caryophyllatus DE KONINCK 8c LEHON, 1854, p. 197, pl. 7, figs. 3a-c. Description.—Calyx calcitic, obconical in side view, rounded pentagonal in top view, 12 mm. long by 8 mm. wide, vault 6 mm. long, pelvis 6 mm. long, pelvic angle 65 degrees, summit rounded, base conical, and periphery 44 1n1 43 45 FIGURES 42-45. Pentrernitidea pailletti (DE VERNEUIL), Devonian, Spain (Harvard Mus. Comp. Zoology, nos. 297, 547; U.S. Natl. Mus. no. S3,621). 42. Plate arrangement <strong>of</strong> anal area (no. 297), x15.-43. Cross section <strong>of</strong> "B" ambulacrum (no. S3,621), X15.-44. Cross section <strong>of</strong> "B" ambulacrum near radial lip (no. 547), x15. 45. Part <strong>of</strong> "E" ambulacrum, showing main, inner, and outer side plates (no. 297), X45. [Explanation.—"A," amb.; An, anal opening; Bf, brachiolar facet; Bp, brachiolar pit; "C," amb.; C, canal (radial); "D," amb.; Db, deltoid body; Dc, deltoid crest; D1, deltoid lip; Ds, deltoid septum; HD, hypodeltoid; ISp, inner side plate; L, lancet; 0, oral opening; OSp, outer side plate; R, radial; RI, radial limb; Sp, main side plate; Ss, spiracular slit; Su, superdeltoid; Sub, subdeltoidd EXPLANATION OF PLATE 7 FIGURE PAGE 1-8. Hyperoblastus preciosus (RE.ImANN), holotype, E15,934, Charles Southworth coll., Buffalo Soc. Nat. Sci.; Devonian, Hungry Hollow Formation (coral zone), Joseph Bell's Quarry, Thedford, Ontario; 1-3, oral, "D" ambulacral, aboral views (X4.4); 4, oral view <strong>of</strong> oral area ( X8.8); 5, anal view showing two prominent cryptodeltoids ( X10.6); 6, tangential view <strong>of</strong> interior right side <strong>of</strong> "E" ambulacrum showing nature <strong>of</strong> branching <strong>of</strong> a hydrospire canal or slit beneath deltoid (X13.2); 7, side view <strong>of</strong> "E" ambulacrum with lancet removed ( X6.8); 8, side view <strong>of</strong> "B" ambulacrum showing large gaps between side plates (X13.2) 31 9. Hyperoblastus filosus (WHITEAvEs), holotype, 3,660, Rev H. Currie coll., identified by WHITEAVES, Geol. Survey Canada; Devonian, Hamilton beds, near Thedford, Ontario; "C" ambulacral view showing gaps between side plates (X15.3) 32
UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS <strong>ECHINODERMATA</strong>, ARTICLE 3 PLATE 7 6 FAY-BLASTOID STUDIES