UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PLATE 2 <strong>ECHINODERMATA</strong>, ARTICLE 3 FAY-BLASTOID STUDIES
BLASTOID STUDIES 25 rived from the Devonian blastoid Pleuroschisma by atrophy <strong>of</strong> a few hydrospire slits on the anal side and fusion <strong>of</strong> the cryptodeltoids and superdeltoid into a single epideltoid plate. Occurrence.—Lower Mississippian, upper part <strong>of</strong> the Burlington Limestone, in chert, Louisiana, Missouri. Types.—Topotype, 29,904, one well-preserved specimen and one fragmentary, Gurley collection, Walker Museum, <strong>University</strong> <strong>of</strong> Chicago, Chicago, Illinois. The holotype is supposed to be in the Rowley collection at the <strong>University</strong> <strong>of</strong> Illinois but is presumably lost. CONOSCHISMA? JESSIEAE (Miller & Gurley) Plate 14, figures 1, 4, 7 Codaster lessieae MILLER & GURLEY, 1896, p. 89, pl. 5, figs. 20-22. Description.—The specimen here described is f ragmentary and questionably placed in this genus. Calyx calcitic, conical in side view, pentagonal in top view, 8 mm. long by 7 mm. wide, with vault 3 mm. long, pelvis 5 mm. long, pelvic angle 75 degrees, and periphery above mid-height at radial lips. Basal circlet 3 mm. high by 5 mm. wide, strongly triangular, with depressed interbasal sutures between the three normally disposed basais. Radials five, each 4.5 mm. long by 4 mm. wide, with deep broad sinus 3.5 mm. long by 2.5 mm. wide; radials overlapping deltoids at high angle. The anal side is partly obscured by limestone matrix and not well preserved. Apparently, a horseshoe-shaped epideltoid surrounds the adorai part <strong>of</strong> the anal opening on three sides and abuts against the radial limbs. Presumably, the anal opening was covered by a hypodeltoid plate on the aboral side <strong>of</strong> the anal opening. The four subquadrangular deltoids are 2 mm. wide by 2 mm. long and confined to the summit. According to PECK (1938), five to seven hydrospire slits occur on each side <strong>of</strong> an ambulacrum, but apparently none in the anal area. If the anal area is not well preserved, however, this feature may be unobservable. The oral opening is surrounded by four deltoid lips and the epideltoid, but relations to the lancet plate are obscure. The ambulacra seem to be narrow or linear and are obscured by matrix. The surfaces <strong>of</strong> the calyx plates are ornamented by fine growth lines parallel to the margins. Remarks.—The above description is based upon characters seen in the specimen figured by PECK (1938, pl. 26, fig. 38). The specimen was further cleaned but to little advantage, and until more perfect specimens are found, it is probably best to classify this species doubtfully as belonging to ConoschIsma. Occurrence.—Lower Mississippian, Chouteau Limestone, Providence, Missouri. Types.—Hypotype 3,573, one specimen, Carl C. Branson collection, <strong>University</strong> <strong>of</strong> Missouri. I have been unable to locate the holotype; other specimens (six) presumed to be at the <strong>University</strong> <strong>of</strong> Missouri are probably lost. Genus CRYPTOSCHISMA Etheridge & Carpenter, 1886 Type-species, by original designation.—Pentrernites schultzii D'ARCI-1- 1AC & VERNEUIL, 1845. Generic diagnosis.—Fissiculate blastoids with eight hidden hydrospire fields, the two normally found on the anal side being absent, epideltoid and hypodeltoid present, lancet completely exposed, spiracular slits prominent, with only aboral ends <strong>of</strong> the hydrospire slits exposed, calyx steeply conical in side view. Devonian, Spain. CRYPTOSCHISMA SCHULTZII (d'Archiac & Verneuil) Plate 3, figures 1-9; text-figs. 12-17 Pentremites schttlizii u'ARcHnic & VERNEUIL, 1845, p. 479, pl. 15, figs. 12-13. Description.—Calyx calcitic, conical in side view, pentalobate in top view, 10.5 mm. long by 8.5 mm. wide, with vault 2 mm. long and pelvis 8.5 mm. long, pelvic angle on subbasals 4 to 5 degrees, on basals and radials 50 degrees, with periphery at radial lips near summit. Stem round, apparently short, elongate conical in side view, approximately 9 mm. long by 2 mm. wide, composed <strong>of</strong> barrel-shaped columnals, each 2 mm. long, with smooth facets, attached to subbasals proximally. Subbasals three, in same position as basais, collectively cylindrical, 3 mm. long by 2.5 mm. wide, with smooth attachment face at EXPLANATION OF PLATE 2 FIGURE PAGE 1-11. Pentremitidea pailletti (DE VERNEUIL ), Lower Devonian, Spain.—I-3. Topotype, 13,876, Gurley coll., Univ. Chicago; Calizas de Ferr<strong>of</strong>ies, Asturias; oral, "D" ambulacral, aboral views (all X5.7).-4 6. Topotype, 297, Schultze coll. Harvard Mus. Comp. Zoology; Calizas de Arnao, near Sabero (Le6n); oral, "D" ambulacral, aboral views (all X5.1).-7, 8. Topotypes, S3,620, Springer coll., U.S. Natl. Mus.; Calizas de Ferrones, Asturias; 7, oral view ( X9); 8, long. sec. topotype S3,621 ( X13).— 9, 10. Topotypes, 547, DeKoninck coll., Harvard Mus. Comp. ZoOlogy; Calizas de Ferr<strong>of</strong>ies, Asturias; 9, oral view with lancet plates removed in "D" and "E" ambulacra ( X6.6); 10, oral view <strong>of</strong> polished section showing marginal slits ( X9.1). //. Topotype, S3,622, Springer coll., U.S. Natl. Mus.; Calizas de Arnao, near Sabero (Le6n); oral view <strong>of</strong> specimen with side plates removed (X9) 39