Fig. 4 in Jurassic rhynchonellide brachiopods from the Jordan Valley

Fig. 4. Serial sections of the rhynchonellide brachiopod Cymatorhynchia quadriplicata (Zieten, 1830). AMNH FI−72369. Bed 21a, Hamam Formation, Arda, Jordan. Numbers describe sectional distance from apex. Abbreviations: c, crus; cb, crural base; dms, dorsal median septum; dp, dental plate; isr, inner socket ridge; osr, outer socket ridge; s, socket; sp, septalial plate; ssm, secondary shell material; t, tooth.