Fig. 11

Secundibrachials, upper Duck Creek Formation, Mortoniceras rostratum Zone (upper Albian); Saginaw Quarry, Fort Worth, Texas. Most of the brachials are assignable to Roveacrinus pyramidalis Peck. a Muscular facet of distal brachial with adoral processes, M11626. b Lateral view of distal brachial with adoral processes on both muscular facets, M11622. c Proximal-adoral view of distal brachial with row of pits on shaft, M11623. d Proximal-adoral view of medial brachial with muscular facets, note food groove dissolved into pits along shaft, M11619. e Aboral-distal view of medial brachial with keeled shaft, M11621. f Lateral view of medial brachial with pinnule socket, M11635. g Lateral view of medial brachial with pathological (?) process, M11695. h Lateral view of compressed brachial, brachial has sharp keel at left (aborally) and furrow at lower right (adorally), proximal muscular facet bent, distal muscular facet with processes for muscle fossae; M11688. i Brachial similar to h but with pinnule socket, M11692. J–l Aboral view of keeled elongate brachials, muscular facets at both ends; M11689 (j), M11688 (k), 11668 (l). m–p Presumed first secundibrachials, proximal facets muscular, distal facets cryptosynarthrial to synostosial; adoral view (m), aboral view (n–o), lateral view (p); M11633 (m), M11693 (n), M11627 (o), M11624 (p)