Fig. 1
From: A fossil crinoid with four arms, Mississippian (Lower Carboniferous) of Clitheroe, Lancashire, UK
Monobathrid camerate crinoid Amphoracrinus sp., RGM.1332253 with only four arms. Key: A–E = Carpenter rays; AT = anal tube. a Apical view, anal tube (incomplete) in CD interray (= posterior); B ray to mid-right. b Basal view, posterior towards bottom of page; B ray to mid-left. Articular facet of column central. c Posterior view; CD interray centre. Specimen uncoated. Scale bar represents 10 mm