36 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS toward the small round lumen. Radials five, elongate hexagonal, with almost subparallel sides, each 10 mm. long by 7 mm. wide, with narrow limbs extended outward from the calyx into bluntly rounded wings; radials overlapping deltoids. Deltoids four, widely lancet-shaped, each 2 mm. long by 2 to 3 mm. wide, with bulbous adoral end <strong>of</strong> a spiracular slit excavated in the middle <strong>of</strong> each side <strong>of</strong> each deltoid. On the anal side a small rounded anal opening occurs between a 7-sided epideltoid and a 5-sided hypodeltoid. The expanded ends <strong>of</strong> the anal spiracular slits are excavated in the epideltoid. The slits extend as openings almost one-half the length <strong>of</strong> each ambulacrum. Internally, five hydrospire folds occur on each side <strong>of</strong> an ambulacrum, each fold opening into each spiracular slit and ending admedially in a sublancet or fused hydrospire plate that underlies the lancet and side plates. The anal opening is covered with about 20 small, flexible, polygonal plates. The oral opening is surrounded by four deltoid lips and the epideltoid, and is covered by five large oral plates that are interradial in position. Radials overlap deltoids. Ambulacra five, narrow, linear, with narrow sinus, 1.5 mm. wide, with lancet covered by side plates near aboral end <strong>of</strong> lancet but exposed along the middle fourth <strong>of</strong> lancet's width along the remainder <strong>of</strong> each ambulacrum. Approximately 30 side plates occur in a space <strong>of</strong> 10 mm. along an ambulacrum, normally disposed, with lenticular secondary side plates between the primary side plates, and admedially disposed from the ambulacral margins. The lancet plates are separated from the oral opening by the wide deltoid lips. The surfaces <strong>of</strong> the calyx plates are ornamented with fine growth striae parallel to plate margins. Remarks.—The type-species was presumably in the Owen collection which was destroyed by fire in 1883 at Indiana <strong>University</strong>. The specimen evidently was not in the Shumard collection, because Hambach had many <strong>of</strong> these types when he sold his collection to Springer and they are not in the collection <strong>of</strong> the United States National Museum. Therefore, neotypes have been erected to replace the destroyed types. Occurrence.—Lower Mississippian, lower part <strong>of</strong> Burlington Limestone, Burlington, Iowa. Types.—Neotypes, S4,961, two specimens, new holotype with oral plates in place (figures 4-7, 9) and new paratype with anal plates in place (figure 8), Springer collection, old number S3,234, U. S. National Museum, Washington. OROPHOCRINUS CAMPANULATUS (Hambach) Plate 13, figures 1-3 Codonites cam panulatus HAMBACH, 1884, p. 553, pl. D, figs. 8-9. Description.—Calyx 18 mm. long by 15 mm. wide, vault 7 mm. long, pelvis 11 mm. long, and pelvic angle <strong>of</strong> 50 degrees. In side view, the calyx is broadly clubshaped and similar to O. stelliformis. The basal circlet is 4 mm. long, the radial circlet 12 mm. long, each radial 7 mm. wide, and the deltoids are each 2 mm. long. There are 34 side plates in 10 mm. length <strong>of</strong> an ambulacrum. Another fragmentary syntype is 21 mm. long by 16 mm. wide. Occurrence.—Lower Mississippian, Chouteau Limestone, Sedalia, Missouri. Types.—Syntypes, S3,236, Hambach collection, purchased by FRANK SPRINGER, one complete specimen and one fragmentary specimen, U. S. National Museum, Washington. OROPHOCRINUS CONICUS Wachsmuth & Springer Plate 15, figures 1-2 Orophocrinus conicus WACHSMUTH St SPRINGER, 1890, p. 201, pl. 15, figs. 1-3. Description.—One specimen is 43 mm. long by 8 mm. wide (Pl. 15, fig. 1); another is 12 mm. long by 8 mm. wide (Pl. 15, fig. 2), with a stem 105 mm. long. The narrow steeply conical form <strong>of</strong> the calyx and long pelvis readily distinguish this species from all others. Occurrence.—Lower Mississippian, Hampton Formation (Kinderhookian), Le Grand, Marshall County, Iowa. Types.—Topotypes (metatypes), S3,226, 78 specimens, Springer collection, U. S. National Museum, Washington. EXPLANATION OF PLATE 5 FIGURE PAGE 1-3. Trionoblastus gracilis (WAcHsmu -rx), plesiotype, E21,142, I. G. Reimann coll., Buffalo Soc. Nat. Sci.; Devonian, Thunder Bay Limestone, Alpena, Partridge Point, Michigan; oral, "D" ambulacral, aboral views (all X6) 49 4-6. Trionoblastus alatus (REimANN), plesiotype, 30,736, Univ Michigan; Potter Farm Formation, shale pit just west <strong>of</strong> Evergreen Cemetery, west <strong>of</strong> Alpena, Michigan; oral view (showing six amulacra), aboral view, "D" ambulacral view (all X6.1) 47 7-9. Trionoblastus canadensis (BILLINGS), plesiotype, E11,760, I. G. Reimann coll., Buffalo Soc. Nat. Sci., Devonian, "Encrinal limestone," Thedford, Ontario; oral, "D" ambulacral, aboral views (all X7) 48
UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS <strong>ECHINODERMATA</strong>, ARTICLE 3 PLATE 5 3