104 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS wide, calcitic, and not well preserved. The radials overlap the deltoids and apparently two hydrospire folds are present on each side <strong>of</strong> an ambulacrum. An excellent description is given by FRITZ & CLINE (1937), who apparently described similar specimens. Occurrence.—Lower Mississippian, Madison Limestone, Squaw Creek, Montana. Type.—Holotype, 347, one specimen, Harvard Museum <strong>of</strong> Comparative Zoology, Cambridge, Mass. TANAOBLASTUS MISSOURIENSIS (Shumard) Plate 36, figures 1-3 Granatocrinus missouriensis SHUMARD, 1866, P. 375. Schizoblastus missouriensis ETHERIDGE & CARPENTER, 1882, p. 247. Cryptoblastus missouriensis PECK, 1938, p. 65, pl. 26, figs. 9-15. Pentremites roemeri SHUMARD ( partim), 1855, p. 186, pl. B, figs. 2b-d; HAMBACH, 1903, pl. 5, fig. 10. Cri broblastus roemeri HAMBACH, 1903, pl. 5, fig. 10. Granatocrinus mutabilis ROWLEY ( partim), 1893, p. 306, pl. 14, figs. 4-5. Description.—Calyx 7.5 mm. long by 6.5 mm. wide, base flat, periphery below center, with linear ambulacra 8 mm. long by 1.5 mm. wide, recurved below, with 28 side plates in a space <strong>of</strong> 10 mm. along an ambulacrum. Comparison <strong>of</strong> photographs indicates difference from other species in calyx shape. Occurrence.—Lower Mississippian, Chouteau Limestone, Sweeney Quarry, Missouri. Type.—Hypotype, 3,576, C. C. Branson collection, <strong>University</strong> <strong>of</strong> Missouri. TANAOBLASTUS TENUIS (Hambach) Plate 36, figures 4-6 Cribroblastus tennis HAMBACH, 1903, p. 63, pl. 5, figs. 17, 17a. Cryptoblastus tennis PECK, 1938, p. 62, pl. 26, figs. 16-17, 22. Description.—Calyx barrel-shaped, with truncated summit and convex base, 7.5 mm. long by 6.5 mm. wide, with linear ambulacra 8 mm. long by 1.25 mm. wide, and periphery central. There are 30 side plates in a space <strong>of</strong> 10 mm. along an ambulacrum. Comparison <strong>of</strong> photographs serves to show differences in shape that distinguish various species. Occurrence.—Lower Mississippian, Chouteau Limestone, near Providence, Missouri. Type.—Hypotype, 3,572, one specimen, C. C. Branson collection, <strong>University</strong> <strong>of</strong> Missouri. Genus TRICOELOCRINUS Meek & Worthen, 1868 Type-species, by original designation.—Pentremites (Troostocrinus?) woodrnani MEEK & WORTHEN, 1868. Generic diagnosis.—Spiraculate blastoids with five paired spiracles, or four paired spiracles and a paired anispiracle, with superdeltoid, two cryptodeltoids, and a hypodeltoid plate on the anal side; lancet covered by side plates, one pore between adjacent side plates along deltoid and radial margins, radials overlapping deltoids, three short hydrospire folds on each side <strong>of</strong> an ambulacrum extending only one-half way down each ambulacrum and ending within the substance <strong>of</strong> the thick radial plates beneath the ambulacra; pelvis long, widely inflated outward; deltoids not visible in side view but large hypodeltoid visible in side view; calyx form subpyramidal, subrounded below, with aborally directed ambulacra. Mississippian, Indiana, Tennessee, Kentucky, Missouri, Illinois. Remarks.—The genus Tricoelocrinus was probably derived from Metablastus by reduction in the number <strong>of</strong> hydrospires to three within the radial plates, and outward inflation <strong>of</strong> the pelvis. TRICOELOCRINUS WOODMANI (Meek & Worthen) Plate 52, figures 1-2 Pentremites (Troostocrinus?) woodmani MEEK & WORTHEN, 1868, p. 356; 1873, p. 506, pl. 16, fig. 4. Tricoelocrinus woodmani ETHERIDGE & CARPENTER, 1886, p. 206, pl. 19, figs. 13-16. Description.—A detailed description <strong>of</strong> the holotype is reserved for another paper, to appear in the Oklahoma Geology Notes. This species may be distinguished from all others by the widely inflated pelvis. Occurrence.—Lower Mississippian, Keokuk? Limestone, Salem, Indiana. EXPLANATION OF PLATE 35 FIGURE PAGE 1-8. Peta1oblastus ovalis (GoLnFuss), "Devonian" [ =Lower Carboniferous], Uebergangskalke, (Etroeungtian), Cromford bei 125.tingen, Germany. 1 3. Topotype, 151, de- Koninck coll., Harvard Mus. Comp. Zoology; oral, "D" ambulacral, aboral views <strong>of</strong> described specimen (all X 15.2).-4 , 6 , 7. Topotypes, 316, Bronn coll., Harvard Mus. Comp. ZoOlogy; 4, cross section <strong>of</strong> specimen showing four hydrospire folds on each side <strong>of</strong> an ambulacrum ( X12); 6,7, two specimens showing details <strong>of</strong> an ambulacrum and "D" ambulacral view ( X12, X 12.8).-5,8. Topotype, 151, deKoninck coll., Harvard Mus. Comp. Zoology; two side views <strong>of</strong> "AB" interambulacrum showing details <strong>of</strong> deltoid plate at pointed adorai tips <strong>of</strong> radial limbs ( X9.7, X11) 92
UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS ECHINODER MATA, A wricts. 3 PLATF 35 FAY- BLASTOID STUDIES