UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PLATE 22 ECHINODERInIATA, ARTICLE 3 FAY-BLASTOID STUDIES
BLASTOID STUDIES 69 and a separate anus. The oral area is covered by approximately 18 oral plates, consisting <strong>of</strong> five large orals in the center, each arrow-shaped and interambulacral in position, bordered aborally by 12 or 13 accessory orals. There are two accessory orals at the adorai end <strong>of</strong> each ambulacrum, and two or three (one <strong>of</strong> which may be a superdeltoid) on the anal side. It is assumed that two hydrospire folds occur on each side <strong>of</strong> an ambulacrum. Ambulacra five, linear, raised, recurved below, each 19 mm. long by 1 mm. wide, with lancet covered by side plates, 26 side plates in a space <strong>of</strong> 10 mm. along an ambulacrum, and side plates disposed as in Nucleocrinus. There is one large pore between adjacent side plates along the deltoid and radial margins, and four cover-plate sockets to each side plate along the main food groove. Inner side plate present. The surfaces <strong>of</strong> the calyx plates are ornamented as in Nucleocrinus by fine growth striae parallel to plate margins, with small aligned granules or ridges on deltoid and cryptodeltoid ambulacral margins, each ridge corresponding in position to one pore, aligned at a high angle to ambulacral margins. Occurrence.—Middle Devonian, Onondaga (Columbus) Limestone, Columbus, Ohio. Types.—Syntypes, 1,317, two specimens, <strong>University</strong> <strong>of</strong> Cincinnati Museum. Syntypes, 6,114, two specimens, Gurley collection, illustrated by GURLEY (1894), p. 63, pl. 8, fig. 26-30, Walker Museum, <strong>University</strong> <strong>of</strong> Chicago. Genus ELEUTHEROCRINUS Shumard & Yandell, 1856 Type-species, by original designation (monotypy).—Elefitherocrinus cassedayi SHUMARD 8c YANDELL, 1856. Generic diagnosis.—Spiraculate blastoids with five spiracles, or four spiracles and an anispiracle, with superdeltoid, two cryptodeltoids, and a hypodeltoid on anal side, six or seven hydrospire folds on each side <strong>of</strong> an ambulacrum, lancet covered by side plates, with one pore between adjacent side plates along deltoid and radial margins, radials overlapping deltoids, calyx plates irregular because <strong>of</strong> shortened "D" ambulacrum; ellipsoidal in side view. Devonian, Kentucky, Indiana, New York, Ontario. Remarks.—The genus Eleutherocrinus was probably derived from Hyperoblastus by complete closure <strong>of</strong> the sinus areas, shortening <strong>of</strong> the (D) ambulacrum, and consequent shifting <strong>of</strong> calyx plates. ELEUTHEROCRINUS CASSEDAYI Shumard & Yandell, 1856 Plate 26, figures 1-8; plate 27, figures 1-11; text-figs. 126-137 Eleutherocrinus cassedayi SHUMARD & YANDELL, 1856, p. 74, pl. 2, figs. 1-5. Description.—The new holotype (neotype) is 18 mm. long by 9 mm. wide, vault 14 mm. long, pelvis 4 mm. long, pelvic angle 70 degrees in left anterior radial view and 85 degrees in anterior radial view. The basal circlet is irregular, with two equal long basals 9 mm. long by 3 mm. wide extending upward on the "D" ambulacral side, azygous basal confined to the base, 3 mm. long by 2 mm. wide. The base <strong>of</strong> the azygous plate has a smooth area about 0.5 mm. from the aboral tip, in which a seemingly round crenellar depression occurs, too illdefined for positive identification. Apparently a stem is absent. A single prominent ridge extends downward on the middle face <strong>of</strong> each basal, that on the azygous basal splitting and extending to the lips <strong>of</strong> the "A" and "B" radials, whereas the other two extend to the "C" and "E" radial lips, respectively. The ridges on the two equal basais each branch and have an extension up the middle <strong>of</strong> the plate, parallel to the interbasal suture. Radials five, irregular in shape and length. The "A," "B," "C," and "E" radials are 16 mm. long, the "A" and "B" radials being symmetrical, 5 mm. wide, with sinus 13 mm. long, whereas the "C" and "E" radials are unsymmetrical, with narrow pointed limbs on the "D" side, each 6 mm. wide, with sinus 14 mm. long. The sinus areas are approximately 1 mm. wide. The "D" radial is short and wide, roughly subquadrangular, 9 mm. long and 7 mm. wide, with short, wide sinus confined to the summit; radials overlapping deltoids. The "AB," "BC," and "EA" deltoids are short, visible in side view, 1 mm. long, triangular, with depressed deltoid septum, and each with a spiracle between the deltoid body and deltoid lip. The "DE" deltoid is short, quadrangular, confined to the summit, and smaller than the other deltoids, but with similarly formed spiracle. On the anal side there are four deltoid plates. The super- EXPLANATION OF PLATE 20 FIGURE 1-9. Cordyloblastus clavatus (ScHut.TzE). 1 3,8. Syntypes, 539, Schultze coll., Harvard Mus. Comp. Zoology; Devonian, near Kerpen, Nollenbach, Germany; 1-3, oral, "A" ambulacral, aboral views ( X4.9); 8, polished cross section <strong>of</strong> "E" ambulacrum looking aborally ( X3). 4-6,9, plesiotype, 19,090, Gurley coll., Univ. Chicago; PAGE Calizas de Arnao, Le6n, Spain; 4-6, oral, "D" ambulacral, aboral views <strong>of</strong> specimen with polished summit ( X5.2); 9, enlarged view <strong>of</strong> fig. 4 ( X7.7). 7. Plesiotype, S3,6I3, Springer coll., U.S. Natl. Mus.; Lower Devonian, Calizas de Arnao, Sabero (Le6n), Spain; "D" ambulacral view (X6.5) 54