Fig. 4

Position of ossicles of Balanocrinus brachiospina Hess, early Late Oxfordian of Savigna, on hypothetical isocrinid, redrawn from the figure of a young Neocrinus decorus (Thomson) in Carpenter (1884, pl. 35, fig. 2). The extant specimen has a similar column, although with less crowded nodals proximally, but differs by small basals and high, symmetric proximal secundibrachials not in lateral contact. The projected figures of B. brachiospina ossicles are copied at half the scale from Hess (2013a), Fig. 5 (cup plates and primibrachials), 6–7 (columnals), and 8–9 (brachials and arm fragments). a Basal circlet, M11343. b Radial, aboral-distal facet, M11253. c First primibrachial, M11251; c1 proximal facet, c2 distal facet. d Second primibrachial, M11247; d1 proximal facet, d2 distal facet. e Proximal facet of skew, hyposynostosial secundibrachial from proximal part of arm, M11292. f Distal facet of skew, aborally rounded secundibrachial from proximal part of arm, M11290. g Distal facet of thorned secundibrachial from median to distal part of arm, M11294. h Oblique adoral view of pinnular, M11305. i Oblique adoral view of two proximal brachials, straight sides with grooves indicate lateral contact, M11298. j Arm fragment of secundibrachials with axillary, distal facets of tertibrachial 2 are synostosial, M11301. k Part of median to distal arm with pinnules, M11369. l Proximal facet of pentalobate nodal, M11259. m Pluricolumnal with three internodals (two with crest) and nodal with cirrals, M11263. n Proximal pluricolumnal with three nodals, M11266. o Pluricolumnal with nodal, M11277. p Pluricolumnal with cirrus, M11281. q Proximal facet of nodal with fossulae, M11270. r Proximal facet of nodal with cirrals, M11267. s Facet of subpentalobate internodal, M11271. t Facet of large circular internodal, M11275. u Terminal cirrus, M11285