Fig. 10

Primibrachials of Roveacrinus pyramidalis Peck, upper Duck Creek Formation, M. rostratum Zone (upper Albian); Saginaw Quarry, Fort Worth, Texas. a Distal facet of non-axillary second primibrachial, M11696. b Aboral view with distal facets of axillary second primibrachial, shaft broken; M11620. c Distal view of axillary second primibrachial, M11617. d Lateral view of high second primibrachial, note small cryptosynarthrial facet to first primibrachial (q); M11673. e Oblique-adoral view of slender second primibrachial with small facets to first secundibrachials, note row of pits on shaft; M11632. f Aboral view of keeled second primibrachial with facets to first secundibrachials, shaft broken; M11686. g Adoral view of broken second primibrachial with high cryptosynarthrial facet to first primibrachial, M11625. h Adoral view of intact second primibrachial with regular row of weak pits, M11684. i Lateral view of second primibrachial with large facet to first primibrachial, M11683. j Aboral view of first primibrachial with groove and cryptosynarthrial facet, M11675. k Aboral view of first primibrachial with cryptosynarthrial facet, note reticulate structure in proximal part; M11641. l Aboral view of slender first primibrachial, M11676. m Lateral view of compressed first primibrachial, M11690. n Adoral view of first primibrachial, M11616. o Proximal-adoral view of first primibrachial, arrow on enlarged ossicle indicates muscle fossae; M11679. p Oblique proximal-lateral view of laterally compressed first primibrachial, M11681. q Lateral view of first primibrachial, distal facet matches proximal facet of large second primibrachial (d); M11674. r Lateral view of cup (Fig. 9i), M11589