Fig. 15

Brachials. Del Rio Formation (lower Cenomanian), Dottie Lynn Locality, Fort Worth, Texas. a, b First primibrachials, possibly belonging to Roveacrinus alatus Douglas; a aboral-distal view, M11734; b adoral-proximal view, M11739. c–w Brachials assigned to Roveacrinus spinosus Peck. c Aboral-distal view of first primibrachial, M11738. d Adoral-proximal view of first primibrachial, M11737. e Proximal-aboral view of first primibrachial, M11742. f Aboral view of strongly sculptured second primibrachial, M11732. g Adoral-distal view of second primibrachial, M11740. h Lateral view of second primibrachial; proximal, cryptosynarthrial facet at left; M11741. i Aboral-distal view of second primibrachial with two spines, M11746. j Aboral view of second primibrachial with one lateral spine, M11747. k Aboral view of second primibrachial without spine, M11743. l Aboral-distal view of sculptured second primibrachial, M11735. m Adoral view of secundibrachial with pinnule socket (arrow), M11745. n Distal view of secundibrachial with aboral spine and corrugated muscle fossa on higher side, M11733. o Secundibrachial with corrugated muscle fossae, M11724. p Asymmetric secundibrachial with aboral spine, high side with corrugated muscle fossae; M11748. q Synostosial facet of secundibrachial with strong spine broken at end, M11730. r Synostosial facet of secundibrachial with sculptured aboral surface, other side muscular with corrugated muscle fossae; M11729. s Secundibrachial with deep food groove and long spine, muscle fossae corrugated; M11731. t Aboral-proximal view of secundibrachial with muscular facet and moderate corrugated muscle fossae, M11744. u Lateral view of secundibrachial with pinnule socket (arrow), M11728. v Oblique lateral view of secundibrachial with pinnule socket (arrow), M11726. w Aboral view of secundibrachial with pinnule socket at left (arrow) and spine at right, M11725