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. UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS PLATE 30 ECHINODERMATA, ARTICLE 3 4 .. .. . ,.. --.• ..,•• AF . .• • - •• :1 • • f ,- - ,,,, -,if . ., . . . , '1Ct, ''s .le:'• '• , ;„0,1 • .1 4 . . , .. ., • , • • k • ' If . • qi, 0 . 4 , . ,w•-„of ... • 7 8 FAY-BLASTOID STUDIES
BLASTOID STUDIES 93 196 194 195 FIGURES 194-196. Placoblastus obovatus (BARtus), Middle Devonian, Thunder Bay Limestone, near Alpena Michigan (Buffalo Soc. Nat. Sci., nos. E21,113, E21,115). 194. Cross section of "D" ambulacrum, aboral view (no. E21,113), X15. 195. Part of "E" ambulacrum, showing main, inner, and outer side plates (no. E21,115), X45. 196. Part of "C" ambulacrum, drawn from polished tangential section (no. E21,115), X45. [Explanation.—Bf, brachiolar facet; Bp, brachiolar pit; CR, cryptodeltoid; D, deltoid; ISp, inner side plate; L, lancet; OSp, outer side plate; P, pore; Sp, main side plate.] five, each short, 8 mm. long by 7 mm. wide, strongly recurved in basal concavity, broadly pentagonal in side view, with short sinus 3 mm. long by 2 mm. wide and wide tapering deltoid margins 4 mm. long between ambulacrum and admedial margins of radial plate. Radiodeltoid suture M-shaped. Deltoids overlap radials. Deltoids four, broadly lenticular, each 43 mm. long by 13 mm. wide, with trifold sculpture as in Nucleocrinus, each ending adorally against an oral plate. On the anal side at least three anal deltoids are present, a long central quadrangular hypodeltoid 41 mm. long by 6 mm. wide, flanked on each side by two lenticular cryptodeltoids 43 mm. long by 3.5 mm. wide. A large hexagonal plate occurs on the adoral side of the anal opening between the adorai tips of the cryptodeltoids. This plate is here interpreted to be a superdeltoid but it could be an accessory anal oral and the superdeltoid could be below it, not visible externally. The oral opening is covered by EXPLANATION OF PLATE 30 FIGURE PAGE 1-9. Nucleocrinus meloniformis (BARais), Middle Devonian, Hungry Hollow Formation (coral zone of Widder beds), near Thedford, Ontario. 1,2. Plesiotype, 3,662a, Geol. Survey Canada; 1, oral view showing five large oral plates in place (X6.4); 2, "B" ambulacrum showing main and outer side plates in place but inner side plates missing, leaving large gaps between side plates (X13).-3. Plcsiotype, E15,939, Charles Southworth coll., Buffalo Soc. Nat. Sel.; tile yard, Thedford, Ontario; polished section of "E" ambulacrum showing inner, outer, and main side plates (X32).-4. Plesiotypes, E148, Buffalo Soc. Nat. Sci.; oral view of polished section showing hidden superdeltoid plate between cryptodeltoids and oral plate on anal side (X9).-5,6. Plesiotypes, E21,120, Charles South' worth coll., Buffalo Soc. Nat. Sci.; tile yard, Thedford, and Hungry Hill, Arkona, Ontario; 5, anal side of spedmen shown in Pl. 29, figs. 1-3, showing large hypodcltoid flanked by ridged cryptodeltoids ( X7.8); 6, aboral view of another specimen (X14.6).-7-9. Plesiotype, 102,707, Charles Southworth coll., U.S. Natl. Mus.; tile yard, Thedford, Ontario; oral; "B" and "C" combined ambulacral, and aboral views of pathological specimen in which the "B" and "C" ambulacra have almost joined ( X 5.1) 86
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