. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. GENERA OF THE SUBORDER ORTHOIDEA 125 The genetic relations of the Wattscllida: appear to be as shown in Table 10. Genus WATTSELLA Bancroft 1928 PI. 22, figs. 9, 13, 14, 17-29 Bancroft, Mem. Proc. Lit. and Philos. Soc., vol. 72, 1928, p. 55, pi. 1, figs. 1-5. Genoholotype.âWatisella wattsi Bancroft 1928. Description. Exterior.âSubcircular, hinge-line straight, narrower than the greatest width of the shell; cardinal extremities rounded; lateral profile unequally bico
. Brachiopod genera of the suborders Orthoidea and Pentameroidea. Orthoidea; Pentameroidea; Paleontology -- Paleozoic. GENERA OF THE SUBORDER ORTHOIDEA 125 The genetic relations of the Wattscllida: appear to be as shown in Table 10. Genus WATTSELLA Bancroft 1928 PI. 22, figs. 9, 13, 14, 17-29 Bancroft, Mem. Proc. Lit. and Philos. Soc., vol. 72, 1928, p. 55, pi. 1, figs. 1-5. Genoholotype.âWatisella wattsi Bancroft 1928. Description. Exterior.âSubcircular, hinge-line straight, narrower than the greatest width of the shell; cardinal extremities rounded; lateral profile unequally biconvex, the ventral valve .ilways with the greater Table 10 Fascicostella Parmorthis Idiorthis <â. Mendacella > Horderleyella Resserella Dalmanellio^ convexity. Anterior commissure rectimarginate to faintly sulcate. Dorsal sulcus shallow, deepest posteri- orly; ventral fold conspicuous only at the posterior. Ventral palintrope longer than the dorsal, curved, apsa- cline, beak incurved, umbo strongly convex. Dorsal palintrope short, faintly anacline, beak inconspicuous; umbo sulcate, delthyrium and notothyrium open. Sur- face multicostellate; shell fibrous, punctate. Ventral interior.âDelthyrial cavity deep; teeth strong; crural fossettes deep; dental plates sharp, divergent, commonly continued forward as a ridge on the lateral periphery of the diductor scars. Muscle area subcordate, more or less gently bilobed in front. Adductor track linear, squarish in front. Diductor scars elongate, rounded in front, and narrowing behind; adjustor scars not separable. Dorsal interior.âCardinalia prominent, brachio- phores elongated into slender points, extending nearly directly ventrally; brachiophore supports triangular in side view, convergent, and uniting with the median ridge; sockets defined by a small fulcral plate. Car- dinal process small; shaft slender, and only defined in the between the brachiophore supports; myo- phorc lobed. Median ridge prominent, extending to t
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