UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PLATE 6 FCHINODERMATA, ARTICLE 3 8 FAY-BLASTOID STUDIES
BLASTOID STUDIES 37 OROPHOCRINUS FUSIFORMIS (Wachsmuth & Springer) Plate 15, figures 3-8 Codonnes jusiformis WACHSMUTH & SPRINGER, in S. A. MILLER, 1889, p. 233, fig. 269. Description.—Calyx steeply conical, narrow, pelvis almost equal in length to vault. Measurements on various forms are slightly different in ratios <strong>of</strong> length to width. One calyx is 34 mm. long by 11 mm. wide ( fig. 6), another is 45 mm. long by 14 mm. wide (fig. 5), one is 28 mm. long by 12 mm. wide with each ambulacrum 1.5 mm. wide (figs. 7-8), and another is 37 mm. long by 11 mm. wide (fig. 4). The narrow form and short pelvis distinguish this species from all others. Occurrence.—Lower Mississippian, Hampton Formation (Kinderhookian), Le Grand, Marshall County, Iowa. Types.—Metatypes, S3,227, ten specimens with pinnules; S3,226, one specimen in with Orphocrinus conicus, Springer collection, U. S. National Museum, Washington. OROPHOCRINUS GRACILIS (Meek & Worthen) Plate 16, figures 1-3 Codonites gracilis MEEK & WoR -rHEN, 1870, P. 32. Description.—Calyx 19 mm. long by 10 mm. wide, vault long and pelvis extremely short. The narrow form and short pelvis distinguish this species from all others. Occurrence.—Lower Mississippian, lower part <strong>of</strong> Burlington Limestone, Burlington, Iowa. Types.—Topotypes, S3,228, three specimens, Springer collection, U. S. National Museum, Washington. OROPHOCRINUS ORBIGNYANUS (de Koninck) Plate 16, figures 4-6; text-fig. 40 Pentremites orbignyanus DEKONINCK, 1842-1844, p. 37, pl. E, figs. 4a-c. Description.—Calyx calcitic, 20 mm. long by 15 mm. wide, vault 7 mm. long, pelvis 13 mm. long, and pelvic angle 45 degrees. Basal circlet 7 mm. long by 9 mm. wide, with flat base 4 mm. wide and three normally disposed basals. Stem round, 3 mm. in diameter, large, with about 72 crenellae extending about 0.5 mm. inward radially from the circumference toward the small circular lumen. Each radial is 13 mm. long by 7 mm. wide, and each deltoid is 5 mm. long by 3 mm. wide. Radials overlap deltoids. Ambulacra five, each 11 mm. long by 2 mm. wide, with lancet covered by side plates along the aboral onefourth <strong>of</strong> each ambulacrum and exposed one-third <strong>of</strong> its width near the oral opening, with 22 side plates in 10 mm. length <strong>of</strong> an ambulacrum. A thick fused hydrospire plate underlies the lancet and side plates. On the anal side an epideltoid and hypodeltoid occur with anal opening between. Ten elongate spiracular slits are present along the margins <strong>of</strong> the ambulacra, the anus being separate. The side plates are elongate abmedially-admedially. The wide form and long pelvis distinguish this species from all others. It is similar to Orophocrinus campanulatus. Occurrence.—Lower Carboniferous, Tournai, Belgium. Types.—Topotypes, S3,229, three specimens, one complete, Springer collection, U. S. National Museum, Washington. OROPHOCRINUS PUZOS (Münster) Plate 16, figures 10-12; text-figs. 41, 41a Pentrenutes puzos MUNSTER, 1839, P. 1, pl. 1, figs. 5a-d. Description.—Calyx calcitic, 8 mm. long by 7 mm. wide, vault 5 mm. long, pelvis 3 mm. long, and pelvic angle 80 degrees. Basal circlet 2 mm. long with three normally disposed basais. Stem round, 1.25 mm. in diameter, with about 33 crenellae. Each radial plate is 6 mm. long by 4 mm. wide, and each deltoid is 2 mm. long by 1.25 mm. wide. The anal opening is between an epideltoid and hypodeltoid. A single spiracular slit occurs on each side <strong>of</strong> an ambulacrum, extending one-half the length <strong>of</strong> each ambulacrum along the radial plate and ending adorally in an expanded opening near the middle <strong>of</strong> the side <strong>of</strong> each deltoid plate. Ambulacra five, each 1.25 mm. wide, with lancet exposed along the middle one-third <strong>of</strong> its width near the oral opening, but completely covered by side plates along the aboral one-third <strong>of</strong> its length. There are 30 side plates in 10 mm. and four cover-plate sockets to each side plate along the main food groove. Four hydrospire folds occur on each side <strong>of</strong> an ambulacrum, each set opening into a spiracular slit. EXPLANATION OF PLATE 6 FIGURE PAGE 1-9. Brachyschisma corrugatum (REimANN), topotypes, E21,134 (figs. 1-3,5), E15,982 (figs. 4,6-7,9), E15,407 (fig. 8), Fred W. Wattles coll., Buffalo Soc. Nat, Sci.; Devonian, Onondaga Limestone, Vogelsanger Quarry, near Williamsville, N.Y.; 1-3,5, oral, "D" ambulacral, aboral, "C" ambulacral views, (X3.4); 4,6, oral, "D" arnbulacral views <strong>of</strong> another specimen ( X3.5); 7, anal view <strong>of</strong> specimen shown in fig. 4, hypodeltoid in place ( X18.6); 8, oblique vert, sec, showing hydrospires on left side <strong>of</strong> "C" ambulacrum, (X10); 9, oral view <strong>of</strong> "D" ambulacrum <strong>of</strong> specimen illustrated in fig. 4, showing incipient slits on right side <strong>of</strong> ambulacrum (X12) 21