Fig. 8
Poecilocrinus latealatus (Peck), upper Duck Creek Formation, Mortoniceras rostratum Zone (upper Albian); Saginaw Quarry, Fort Worth, Texas. Secundibrachials of various morphologies, concavity of wings is directed aborally. a Brachial with shallow-concave aboral wing and two muscular facets, muscle fossae corrugated; M11661. b Brachial with deep-concave aboral wing, muscle fossae corrugated; M11655. c Brachial with deep, elliptical wing, M11665. d Proximal or distal-adoral view of brachial without wing, muscle fossae corrugated, other side synostosial; M11659. e Adoral view of wingless brachial, both facets muscular, muscle fossae corrugated; M11670. f Adoral view of winged brachial, M11663. g Adoral view of winged brachial, facet directed downwards cryptosynarthrial; M11662. h Adoral-proximal view of winged brachial with cryptosynarthrial facet, M11652. i Synostosial facet of wingless brachial, other facet muscular with corrugated fossae; M11660. j Synostosial facet of winged brachial, M11648. k Winged brachial with synostosial facet matching brachial, M11649. l Adoral-proximal view of winged brachial with cryptosynarthrial facet, M11653. m Lateral view of winged brachial with muscular (right) and cryptosynarthrial facet (top), wing at left; M11657. n Synostosial facet of wingless brachial, other side muscular with corrugated muscle fossae; M11658. o Muscular facet of brachial with corrugated fossae, other facet synostosial; M11656. p Brachial with spoon-like wing and corrugated muscle fossae; M11628. q Brachial with leaf-like wing, M11634. r High brachial with deep food groove and corrugated muscle fossae, both facets muscular, aboral wing with ridge; M11664. s Smaller brachial similar to r, M11672. t Brachial with irregular, nearly spine-like wing, both facets muscular; M11677. u Brachial with aboral spine and corrugated muscle fossae, both facets muscular; M11629. v Brachial with dagger-like spine, both facets muscular, muscle facets corrugated; M11671. w Brachial with spine, both facets muscular, muscle facets weakly corrugated; M11669