72 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS are seven hydrospire folds on each side <strong>of</strong> a normal ambulacrum ("A," "B," "C," "E") and 6 hydrospire folds on each side <strong>of</strong> the "D" ambulacrum. The "D" ambulacrum is 3 mm. long by 3 mm. wide, the "A" and "B" ambulacra 15 mm. long by 1.25 mm. wide, and the "C" and "E" ambulacra 17 mm. long by 1.25 mm. wide, the widest part being adjacent to the deltoids. The lancet plate is covered by side plates, with 22 side plates in a space <strong>of</strong> 10 mm. along a normal ambulacrum. The "D" ambulacrum has seven side plates in all on each side, but these are similar to those <strong>of</strong> the other ambulacra except for being more elongate. The side plates are normally disposed, with one large pore between adjacent plates along the deltoid and radial margins, and five cover-plate sockets to each side plate along the main food groove. The surfaces <strong>of</strong> the calyx plates are ornamented with fine growth lines parallel to plate margins. Occurrence.—Middle Devonian, Hamilton Group, Beargrass Creek, Jefferson County, Kentucky (S4,960). Hamilton Group, Louisville, Kentucky (S4,963). Coral zone <strong>of</strong> Widder beds, Hungry Hollow Formation, Thedford, Ontario (108; 3,665; E13,061; E15,933). Types.—Neotypes, S4,960 (new holotype); S4,963 (new paratype), old numbers S3,666 and S3,665 respectively, Springer collection, S4,963 figured by ETHERIDGE & CARPENTER (1886), pl. 19, fig. 3, U. S. National Museum, Washington. Plesiotype, 108, one specimen, <strong>University</strong> <strong>of</strong> Illinois, Urbana. Plesiotype, 3,665, Geological Survey <strong>of</strong> Canada, Ottawa. Plesiotypes, E13,061, four fragmentary specimens, Charles Southworth collection (1941); and E15,933, one specimen, Charles Southworth collection (1943), Buffalo Society <strong>of</strong> Natural Sciences, Buffalo, New York. Genus ELLIPTICOBLASTUS Fay, 1960 Type-species, by original designation.—Pentatrematites orbicularis SOWERBY, 1834. Generic diagnosis.—Spiraculate blastoids with five spiracles, or four spiracles in addition to an anispiracle, with superdeltoid, two cryptodeltoids, and a hypodeltoid on anal side, a hydrospire plate, approximately twice as many pores as side plates along the deltoid and radial margins, one long, curved hydrospire fold on each side <strong>of</strong> an ambulacrum, radials overlapping deltoids, lancet exposed along middle one-third <strong>of</strong> its width, and calyx shape elliptical. Lower Carboniferous, England. Remarks.—The genus Ellipticoblastus was probably derived from Globoblastus by reduction <strong>of</strong> the two hydrospires on each side <strong>of</strong> an ambulacrum to one. The lancet plate migrated outward, thus exposing the middle portion. ELLIPTICOBLASTUS ORBICULARIS (Sowerby) Plate 43, figures 7-9, 12; text-fig. 138 Pentatrematites orbicularis SOWERBY, 1834, P. 456, pl. 33, fig. 5. Ellipticob/astus orbicularis (SOWERBY) FAY, 1960, p. 315-317, pl. 1, fig. 7. Description.—Calyx calcitic, flattened globular, 8.5 mm. long by 8 mm. wide, with periphery near mid-height at radiodeltoid suture. Stem round, crenellar, 1 mm. in diameter, with small, central, round lumen. Basal circlet pentagonal in basal view, 3 mm. in diameter, in slight basal concavity, with three normally disposed basal plates. Radials five, each pentagonal in side view, extending onehalf <strong>of</strong> length <strong>of</strong> the calyx, with long, narrow, shallow sinus 5.5 mm. long by 1.25 mm. wide; radials overlapping deltoids at a high angle. The angle formed along the radiodeltoid suture, with center at junction <strong>of</strong> interradial sutures with radiodeltoid sutures is 95 degrees. Deltoids four, long, lancet-shaped, each 6 mm. long by 3.5 mm. wide, each pierced in the adoral tip by one large oral spiracle. Each spiracle has a steep raised margin and each wide, short deltoid lip has approximately seven long cover-plate lobes along the aboral margin. On the anal side two external anal deltoids are seen, a superdeltoid and hypodeltoid, with anispiracle between. Anal opening filled with matrix. It is assumed that two small cryptodeltoids are present but covered, as seen in other specimens. One hydrospire fold is present on each side <strong>of</strong> an ambulacrum, as in other specimens. EXPLANATION OF PLATE 21 FIGURE 1-10. Cordyloblastus eifelensis (RoEmER). 1 3. Topotype, 213, Schultze coll., Harvard Mus. Comp. Zoology; Middle Devonian (Eifelian), Nollenbach, near Kerpen, Germany; oral, "D" ambulacral, aboral views (all X3.7). 4,5,7. Plesiotype, E21,087, Buffalo Soc. Nat. Sci.; Middle Devonian, Eifel, Germany; oral, "D" ambulacral, aboral views <strong>of</strong> an immature specimen (all X 13.1).-6,8. Plesiotype, 195, Schultze coll., Harvard Mus. Comp. Zoology; Middle Devonian, Eifel, Germany; oral and "DE" PAGE interambulacral views <strong>of</strong> an abnormal specimen showing development <strong>of</strong> a small sixth radial plate in "DE" interambulacrum ( X 3.8).-9,10. Topotypes, 305, Schultze coll., Harvard Mus. Comp. Zoology; Middle Devonian (Eifelian), Nollenbach, near Kerpen, Germany; 9, long. polished section <strong>of</strong> an ambulacrum showing hydrospires ( X13); 10, oral view <strong>of</strong> polished section showing the two cryptodeltoids (slightly darker calcite) resting on lightercolored superdeltoid near oral opening and extending aborally (downward) (X5) 56
UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PCHINODER MATA, ARTICLE' PL ATE 21 9 FAY-BLASTOID STUDIES