UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PLATE 34 ECHINODER MATA, ARTICLE 3 2 FAY ASTOID STUDIES
BLASTOID STUDIES 101 Occurrence.—Lower Mississippian, lower part <strong>of</strong> Encrinital (Burlington) Limestone, Boone and Marion Counties, Missouri. Types.—Holotype, S3,735, with a green label in a glass vial with two fragments with orange labels, Shumard collection, <strong>of</strong> the Hambach collection, sold to SPRINGER, now in U. S. National Museum, Washington. HAMBACH evidently had some <strong>of</strong> SHUMARD ' S types in his personal collection when he sold his collection to SPRINGER. The type probably came from Marion County, Missouri, judging from the label. SCHIZOBLASTUS WINSLOWI (Miller & Gurley) Plate 46, figures 3-5 Oranatocrinus wins/owl MILLER & GURLEY, 1894, p. 66, pl. 6, figs. 34-35. Orbitremites winslowi BATHER, 1899, p. 32. Description.—The calyx <strong>of</strong> the holotype is silicified, imperfectly preserved, 11.5 mm. long by 12 mm. wide, with vault 11.5 mm. long, pelvis flat, with periphery above radiodeltoid suture. Stem round, 0.5 mm. wide. Basal circlet pentagonal in aboral view, 2 mm. wide. Radials five, each 8 mm. long by 6.5 mm. wide, pentagonal in side view, extending to mid-height, with a 120 degree angle formed by radial limbs at radiodeltoid suture, with center at interradial suture. The radial sinuses are each 6 mm. long by 2 mm. wide. Deltoids overlap radials. Deltoids four, each 8 mm. long by 6 mm. wide, with two spiracles notched in the adorai tip <strong>of</strong> each. It is presumed that an anal opening was present between an epideltoid and a hypodeltoid plate, and that two hydrospire folds are present on each side <strong>of</strong> an arnbulacrum. Ambulacra linear, long, recurved below, each 15 mm. long by 2 mm. wide, with lancet exposed along main food groove, but covered by side plates at the aboral end, and 30 side plates in a space <strong>of</strong> 10 mm. along an ambulacrum. Side plates and pores normally disposed. The surfaces <strong>of</strong> the deltoids and radials are covered by large aligned nodes, with about eight nodes in three longitudinal rows on each deltoid, and nine nodes in three aligned rows on each radial, the rows being subparallel to the plate margins. Occurrence.—Lower Mississippian, ?Burlington Limestone (drift), at Danville, Illinois ( ?transported from Burlington Limestone outcrops to the north). Type.—Holotype, 6,621, one specimen, Walker Museum, <strong>University</strong> <strong>of</strong> Chicago. Genus TANAOBLASTUS Fay, n. gen. Type-species, by original designation (herein).—Pentremites roerneri SHUMARD, 1855. Generic diagnosis.—Spiraculate blastoids with nine openings around mouth, consisting <strong>of</strong> eight spiracles and an anispiracle, with anispiracle between a superdeltoid, and hypodeltoid, with two hidden cryptodeltoids, deltoids moderately short, pores absent along deltoid margins, with hydrospire plate and two pores to each side plate along radial margins, two hydrospire folds on each side <strong>of</strong> an ambulacrum, lancet exposed along main food groove, interradial sutures even, base flat to convex outward, radials overlapping deltoids; form <strong>of</strong> calyx subelliptical. Mississippian, Missouri, Montana, ?Arizona, Alberta. Remarks.—The genus Tanaoblastus may have been derived from some primitive type <strong>of</strong> Lophoblastus in which the pores atrophied along the deltoids, and the ambulacral margins <strong>of</strong> the radials infolded to form two pores to each side plate, with reduction <strong>of</strong> the number <strong>of</strong> hydrospire folds to two. TANAOBLASTUS ROEMERI (Shumard) Plate 36, figures 7-12; text-figs. 209-213 Pentremites roemeri SHUMARD (partim), 1855, p. 186, pl. B, fig. 2a; 1-1Amancx, 1884, pl. D, figs. 3, 3a. Schizoblastus? roemeri KEYES, 1894, p. 137. Cryptoblastus roemeri PECK, 1938, p. 60, pl. 26, figs. 19-21, 23-24. Pentremites sampsoni HAMBACH, 1884, p. 551, pl. D, figs. 2, 2a. Schizoblastus SaMpsoni ETHERIDGE & CARPENTER, 1886, p. 223. Description.—Calyx calcitic, 6.5 mm. long by 5.5 mm. wide, vault 6 mm. long, pelvis 0.5 mm. long, and pelvic angle 150 degrees. The calyx is elliptical in side view, with truncated summit, convex base, and periphery at radiodeltoid suture about one-third <strong>of</strong> the distance down from the summit. Stem round, 0.25 mm. wide, crenellar. EXPLANATION OF PLATE 34 FIGURE PAGE 1-9. Placoblastus angularis (Lyox), plesiotypes, E11,629 (figs. 1-3,7), E9,057 (fig. 8), E9,058 (figs. 4-6,9), Reimann coll., Buffalo Soc. Nat. Sci.; Middle Devonian, Ludlowville Formation (Tichenor Limestone), Cazenovia Creek, Springbrook, N.Y.; 1-3, oral, "D" ambulacral, and aboral views <strong>of</strong> gerontic paratype <strong>of</strong> Nucleocrinus powelli REI- MANN ( X 1.2); 4-6, oral, "D" ambulacral, and aboral views <strong>of</strong> holotype <strong>of</strong> N. powelli ( X3); 7, detail view <strong>of</strong> "B" ambulacrum <strong>of</strong> specimen shown in fig. I ( X13); 8, aboral view <strong>of</strong> another paratype <strong>of</strong> N. powelli ( X8); 9, oral view <strong>of</strong> specimen shown in fig. 4, showing what appears to be several large plates between adorai tips <strong>of</strong> cryptodeltoids, anal opening in black ( x2.6) 95