UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PLATE 10 ECHINODER MATA, ARTICLE 3 FAY-BLASTOID STUDIES
BLASTOID STUDIES 45 30 side plates in 10 mm. The lancet is approximately 1 mm. distant from the oral opening and confined to the summit. The primary side plates are elongate, with long side food grooves, and small normally disposed outer side plates on the abmedial margins <strong>of</strong> the primary side plates. There are five or six main cover-plate sockets along the interdeltoid sutures and two or three sockets on the adoral margin <strong>of</strong> each deltoid lip adjacent to the oral opening. The surfaces <strong>of</strong> the calyx plates are worn but appear to have fine growth striae parallel to plate margins. Occurrence.—Permian beds, Krassnoufimsk, Urals, USSR. Types.—Metatypes, 695, one specimen, N. N. Yakovley collection, upon which description is based, Illinois Geological Survey, Urbana; 102,187, one specimen, N. N. Yakovlev collection, old no. 16, one specimen, U. S. National Museum, Washington. Genus TFIAUMATOBLASTUS Wanner, 1924 Type-species, by original designation.—Thaumatoblastus longiramus WANNER, 1924. Generic diagnosis.—Fissiculate blastoids with ten hydrospire fields, small anal opening between a large epideltoid and a large hypodeltoid, a reduced number <strong>of</strong> slits on the anal side, but seven or eight slits on the other interambulacral areas, widely exposed, with long lancet plates extended into winglike extensions <strong>of</strong> the radials, lancet almost completely covered by side plates, with rounded base and flat summit. Permian, Timor Island, Indonesia. Remarks.—The genus Thaumatoblastus was probably derived from a form similar to Conoschisma, in which the sinuses migrated outward and upward and the radial limbs became winglike. THAUIVIATOBLASTUS LONGIRAMUS Wanner Plate 18, figure 12; text-fig. 56 Thaumatoblastus longiramus WANNER, 1924, p. 201, pl. 2, figs. 1 - 17; pl. 4, fig. 2; pl. 5. Description.—The one specimen examined is a fragmentary radial plate with lancet and side plates preserved. The important observation that should be added to the description given by WANNER iS that an outer side plate is present on each primary side plate, normally disposed on the bevelled abmedial-adoral corner <strong>of</strong> the primary side plate. Also the lancet plate is almost completely covered by the side plates. Occurrence.—Upper Permian, Basleo beds, Basleo, Timor Island, Indonesia. Type.—Topotype, S4,053, three radial fragments, Springer collection, U. S. National Museum. Genus TRIONOBLASTUS Fay, n. gen. [-=?Heteroschisma WACHSMUTH, 1883] Type -species, by original designation (herein).—Pentremites subtruncatus HALL, 1858. Generic diagnosis.—Fissiculate blastoids with eight exposed hydrospire fields, a superdeltoid, subdeltoid, and presumably hypodeltoid on the anal side, hydrospire slits absent on anal side, with lancet covered by side plates, and form steeply conical in side view. Middle Devonian, North America (Michigan, Ohio, Indiana, Kentucky, New York, Iowa, Ontario). Remarks.—The genus Trionoblastus was probably derived from Decaschisma by fusion <strong>of</strong> the cryptodeltoids into a subdeltoid plate and atrophy <strong>of</strong> the hydrospire slits on the anal side. TRIONOBLASTUS SUBTRUNCATUS (Hall) Plate 4, figures 1-3; text-figs. 57, 58 Pentremites subtruncatus HALL, 1858, p. 485, pl. 1, fig. 4. Description.—Calyx calcitic, obconical in side view, pentagonal in top view, 11.5 mm. long by 7 mm. wide, vault 2 mm. long, pelvis 9.5 mm. long, pelvic angle 40 degrees, periphery at radial lips well above mid-height, with flat summit and conical base (broken). Basal circlet elongate conical in side view, pentagonal in basal view, 5 mm. long by 5 mm. wide, with three normally disposed EXPLANATION OF PLATE 10 FIGURE PAGE 1-3,8. Hyperoblastus goldringae (REImANN), 1-3, syntype E9,049, Buffalo Soc. Nat. Sci.; Devonian, Ludlowville Formation (Pleurodictyum beds), Cazenovia Creek, Gehle farm, 0.12 mile below Transit Road bridge, N.Y.; 1-3, oral, "D" ambulacral, aboral views (all X 7.5)-8, plesiotype, E21,160, F. W. Wattles coll., Buffalo Soc. Nat. Sci.; Devonian, Wanakah Shale (Pleurodictyum beds), old quarry at Bay View, N.Y.; cross sec, <strong>of</strong> specimen showing four hydrospire folds on each side <strong>of</strong> an ambulacrum, aboral view ( X4) 33 4-6. Hyperoblastus juvenis (REimANN), syntypc, E9,054, Buffalo Soc. Nat. Sci.; Devonian, Ludlowville Formation (Pleurodictyum beds), old quarry at Bay View, N.Y.; oral, "D" ambulacral, aboral views (all X11.1) 33 7. Hyperob1astus perovalus (REImANN), holotype, E12,267, Buffalo Soc. Nat. Sci.; Devonian, Tully Limestone (pyrite), Cazenovia Creek, Springbrook, N.Y.; side view ( X8) 33 9-11. Hyperoblastus leans (REimArnnt), syntype, E9,052, Buffalo Soc. Nat. Sci.; Devonian, Ludlowville Formation (Pleurodictyum beds), Athol Springs, N.Y.; oral, "D" ambulacral, aboral views (all X4.6) 33