Fig. 2 in A revaluation of rhipidocystid echinoderms based on a new flattened blastozoan from the Upper Ordovician of Maryland, USA

Fig. 2. Rhipidocystid echinoderm Durhamicystis americana gen. et sp. nov. from the Upper Ordovician Chambersburg Formation, Maryland, USA. A. Paratype USNM 642511a, b; general view showing two nearly complete superimposed specimens (A1); detail of the oral area, proximal brachioles attached to marginal, oral, and floor plates, and three apertures (periproct, hydropore slit, and tiny gonopore) (A2); specimen in left lateral view showing the thin central plates from both integuments (A3); specimen in right lateral view showing the position of the periproct (A4); detail of facets between brachiolar plates and cryptic vertical sutures indicated by arrows (A5); detail showing thin internal projections of weathered, U-shaped, marginal plates (A6). Specimens whitened with ammonium chloride sublimate.