44 THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS opening, covered by a few large side plates; shape <strong>of</strong> calyx in side view like a cup, with three basals. Permian, Timor Island, East Indies. Remarks.—The genus Pterotoblastus was probably derived from a form similar to Codaster in which the hydrospire slits had become atrophied to a few in each field, the hydrospire fields reduced to small areas on the summit, and the radial plates developed into winglike extensions. PTEROTOBLASTUS GRACILIS Wanner Plate 18, figures 10-11; text-fig. 51 Pterotoblastus gractlis WANNER, 1924, P. 10, text-figs. 1-2, pl. 199, figs. 11-18. Description.—The description is the same as that for the genus. The specimen is approximately 8 mm. long by 11 mm. wide. Of importance here is the fact that there are three normally disposed basal plates and not one plate, as previously reported. This is based on examination <strong>of</strong> five almost perfect specimens recently received from Indonesia. Occurrence.—Upper Permian, Basleo beds, from Tonino, Kioe Kilo, near Basleo, Timor Island, Indonesia. Type.—Topotype, S4,035, one specimen, Springer collection, U. S. National Museum, Washington. Genus SAGITTOBLASTUS Yakovlev, 1937 Type-species, by original designation.—Timoroblastus wanneri YAKOLEV, 1926. Generic diagnosis.—Fissiculate blastoids with eight small deep exposed hydrospire fields, with two or three hydrospire slits in each hydrospire field, hydrospire fields on summit, with large epideltoid on anal side and anal opening between radial limbs and epideltoid, with perhaps a small ?hypodeltoid (missing) on the aboral side <strong>of</strong> the anal opening, extremely short lancet plates covered by large side plates, well away from oral opening; calyx form spherical in side view. Permian, Russia. Remarks.—The genus Sagittoblastus was probably derived from a form similar to Codaster in which the hydrospire fields are reduced in size to small, deep constrictions, the hydrospire slits reduced in number in each field, and the form changed to spherical, with consequent shortening <strong>of</strong> the lancet plates and migration <strong>of</strong> lancets away from the oral opening. SAGITTOBLASTUS WANNERI (Yakovlev) Plate 18, figures 1-7; text-figs. 52-55 Timoroblastus wanneri YAKOLEV, 1926, pp. 54-55, text-fig. 5, pl. 1, figs. 8-10. Description.—Calyx calcitic, subglobular in side view, rounded pentagonal in top view, 11 mm. long by 10 mm. wide, with slightly flattened summit, convex base, and periphery near mid-height. Stem impression not well preserved, but appears to be round, 0.75 mm. in diameter, and in a basal concavity. Basal circlet wide, rounded pentagonal, 3.5 mm. high by 8.5 mm. wide, with three large normally disposed basais. Radials five, elongate hexagonal, each 7 mm. long by 5 mm. wide, with short, flat to deeply concave radial sinus 1.5 mm. long by 1 mm. wide, with short, flat to deeply concave radial sinus 15 mm. long by 1 mm. wide, almost confined to summit. Deltoids appear to overlap radial limbs. Deltoids four, strongly arrow-shaped, each 2.5 mm. long by 2.5 mm. wide, with two deep concave hydrospire fields near adjacent ambulacral margins in the aboral part <strong>of</strong> the deltoid body, with two or three hydrospire slits in each hydrospire field parallel to the ambulacra and extending across the radiodeltoid suture. On the anal side a large hexagonal epideltoid is found, with the anal opening between it and the adjacent radial limbs, hydrospire slits lacking. It is assumed that a small hypodeltoid plate was present on the anal side, adjacent to the radial limbs, but washed away. Thus there are nine openings around the oral aperture, consisting <strong>of</strong> eight deep hydrospire fields and a separate anal opening. The deltoid lips and epideltoid surround the oral opening, and the lancet plates are displaced away from the oral opening. Ambulacra five, short, diamond-shaped, each 3 mm. long by 1.5 mm. wide, with lancet covered by side plates, EXPLANATION OF PLATE 9 FIGURE PAGE 1-3. Hyperoblastus cummingsi (ItEimANN), hypotype, E15,935, Buffalo Soc. Nat. Sci.; Devonian, Hungry Hollow Formation (coral zone <strong>of</strong> Widder beds), Arkona, Ontario; oral, "D" ambulacral, aboral views (all X4.4) 31 4-6. Hyperoblastus southworthi (REIMANN), holotype, E11,816, Charles Southworth coll., Buffalo Soc. Nat. Sci.; Devonian, Hungry Hollow Formation (coral zone <strong>of</strong> Widder beds), tile yard, Thedford, Ontario; oral; "D" ambulacral, aboral views (all X7.8) 35 7, 9- 11. Hyperoblastus dotis (REImANN), holotype, E15,401, (figs. 9-11); paratype, E13,052, (fig. 7); Buffalo Soc. Nat. Sci.; Devonian, Hungry Hollow Formation (coral zone <strong>of</strong> Widder beds), Thedford, Ontario; 7, cross sec. "E" arnbulacrum ( X6.5); 9-11, oral; "D" ambulacral, aboral views ( X8) 8. Hyperoblastus filosus angustus (REIMANN), holotype, E15,403, Buffalo Soc. Nat. Sci.; Devonian, Hungry Hollow Formation (coral zone <strong>of</strong> Widder beds), Thedford, Ontario; "D" ambulacral view ( X6.4) 31 33
UNIVERSITY OF KANSAS PAL. LONTOLOGICAL CONTRIBUTIONS ECHINOBI7RMATA, ARTICLE 3 PLATE 9 FAY-BLASTOID STUDIES