FIGURE 3 in Melvicalathis, a new brachiopod genus (Terebratulida: Chlidonophoridae) from deep sea volcanic substrates, and the biogeographic significance of the mid­ocean ridge system *

FIGURE 3. Melvicalathis macroctena (Zezina, 1981) from the Southeast Indian Ridge. A. Interior of AU B320 showing small cardinal process, internal view of costae, and correspondence between costae and scalloped margin. B. Lateral view of AU B320 showing slightly biconvex valves and strongly attrite beak. C. Posterior view of AU B320 to show hypothyrid foramen and costae. D. Close­up of C, showing pedicle collar, teeth and punctae. E. Close­up of ventral valve of AU B321 showing pedicle collar, teeth, and very narrow deltidial plates. F. Close­up of dorsal valve of AU B321 showing retracted dried pedicle, sockets and socket ridges, proximal end of crura, and part of dried lophophore. G. Lateral view of AU B321 to show rounded, ventrally­directed crural processes and dried lophophore.