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78 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS of an ambulacrum, extending a long distance down the sides of the radial limbs. METABLASTUS LINEATUS (Shumard) Plate 19, figures 6-8; text-figs. 158-160 Pentremites lineatus SHUMARD, 1858, p. 241, pl. 9, figs. 3a-b. Description.—The new holotype (neotype) is 33 mm. long by 12 mm. wide, vault 13 mm. long, pelvis 20 mm. long, pelvic angle 25 degrees, and shape of calyx in side view elongate conical, with truncated summit. Pentagonal in top view. Basal circlet conical in side view, 10.5 mm. long, with three normally disposed basals. Radials 22 mm. long, overlapping deltoids. Deltoids not visible in side view except where seen along ambulacral margins. Deltoids four, triangular, confined to summit, each with a paired spiracle at its adoral tip. On the anal side there are four deltoid plates, a superdeltoid occurring next to the oral opening with two elongate cryptodeltoids, each 2 mm. long resting on it and adjacent radial limbs projecting over them. The pentagonal hypodeltoid, 4 mm. long by 3 mm. wide, rests on the cryptodeltoids and abuts against the adjacent radial limbs. A paired anispiracle is present on the anal side; thus five paired spiracles occur on the summit (or four spiracles in addition to a paired anispiracle). Four hydrospire folds are seen on each side of an ambulacrum. Ambulacra five, linear, each 13 mm. long by 1 mm. wide, with lancet covered by side plates, and 24 side plates in a length of 10 mm. along an ambulacrum, with four cover-plate sockets to each side plate along ambulacral groove. The ambulacra are set deep within narrow sinus walls. The side plates are normally disposed, with one pore between adjacent side plates along the deltoid and radial margins. The radial plates are thin, and the hydrospires extend almost the length of the ambulacra. The surfaces of the calyx plates are ornamented by fine growth lines parallel to plate margins. Renzarks.—The type specimen was probably destroyed and therefore a new holotype and paratype have been herein selected, described above. Occurrence.—Lower Mississippian, upper part of Burlington Limestone, Sagetown, Illinois. Types.—Neotypes, S4,958 (new holotype), and S4,957 (new paratype), Springer collection, old no. S3,628 (holotype in slab and paratype a cut section), U. S. National Museum, Washington. 148 149 FIGURES 147-150. Lophoblastus inopinatus (RowLEy & HARE), Lower Mississippian, Burlington Limestone, Louisiana, Missouri (Univ. Illinois, no. RX-134h). 147. Summit area, X15. 148. Basal area, X15. 149. Cross section of ambulacrum, X15. 150. Part of "A" ambulacrum, showing side plates, X45. [Explanation.—An, anal opening; Bf, brachiolar facet; Bp, brachiolar pit; C, canal (radial); D, deltoid; ED, epideltoid; HD, hypodeltoid; L, lancet; 0, oral opening; P, pore Pf, pore furrow; S, spiracle; Sp, main side plate; Z, azygous basal.]
BLASTOID STUDIES 79 154 152 157 155 156 FIGURES 151-157. Mesoblastus crenulatus (RoEmER), Lower Carboniferous, Tournaisian, Tournai, Belgium (U.S. Natl. Mus., no. S3,775; Univ. Chicago, nos. 5,196, 19,083). 151. Anal area (no. 5,196), X15. 152. Basal area, showing stern impression (no. 5,196), X15. 153. Partial cross section of "C" ambulacrum, aboral view (no. 19,083), X15. 154. Part of "E" ambulacrum, showing side plates (no. 5,196), X45. 155. Partial cross section of "B" ambulacrum, aboral view (no. S3,775) x30. 156. Part of ambulacrum showing side plates, edges of subjacent lancet indicated by broken lines (no. S3,775), X17.5. 157. Part of ambulacrum, showing side plates (no. S3,775), X17.5. [Explanation.—An, anal opening; Bf, brachiolar facet; Bp, brachiolar pit; C, canal (radial); CR, cryptodeltoid; D, deltoid; H, hydrospire; HD, hypodeltoid; HP, hydrospire plate; L, lancet; 0, oral opening; OSp, outer side plate; P, pore; Pf, pore furrow; R, radial S, spiracle; Sp, main side plate; Su, superdeltoid; Z, azygous basal.] METABLASTUS BIPYRAMIDALIS (Hall) Plate 51, figure 6 Pcntremites bipyramidalis HALL, 1858, P. 607, pl. 15, fig. 2 (type species of Saccoblastus Hambach, 1903). Description.—This species may be distinguished from others by comparing the length of the pelvis against the width and length of the specimen and noting that the radial bodies flare. The pelvis is short and the specimen is wide. This combination is not seen in other species. Occurrence.—Mississippian, Keokuk Limestone, Boonville, Missouri. Type.—Holotype, 7,226/1, American Museum of Natural History, New York, N. Y. METABLASTUS NITIDULUS (Miller & Gurley) Plate 51, figures 3-4, 7 Troostocrinus nitidulus MILLER & GURLEY, 1890, 1891, p. 373, pl. 9, figs. 14-15; pl. 10, fig. 14. Description.—The description is based on one of the syntypes. Calyx silicified, bipyramidal in side view, with flat summit and base, pentagonal in top view, 10.5 mm. long by 4 mm. wide, vault 3 mm. long, pelvis 7.5 mm. long, pelvic angle on radial bodies 15 degrees, with
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