Fig. 17

Cups of Roveacrinus peracutus Peck, Del Rio Formation (lower Cenomanian), Dottie Lynn Locality, Fort Worth, Texas. a Lateral view of intact cup with radial flange accompanied by narrow interradial flanges, M11718. b Small cup lacking interradial flanges, M11719. c Lateral-adoral view of low cup without interradial flanges, interradial sutures distinct; 11717. d Lateral view of broken cup with well-developed interfacet processes, M11722. e Aboral view of broken cup with largely intact partition at the centre and peripheral radial openings, M11721. f Adoral view of cup, M11720