. Bulletin of the British Museum (Natural History), Geology. . (°) Fig. 8. The dorsal interior (a) and the ventral internal mould (b) of Rhactorthis crassa gen. et sp. nov., X5 approx.: a, adductor scar ; b, brachiophore ; c, pedicle callist ; d, diductor scar ; m, vascula media ; y, vascula myaria. Family SKENIDIIDAE Kozlowski 1929 Genus SKENIDIOIDES Schuchert & Cooper 1931 Type species. Skenidioides billingsi Schuchert & Cooper by original designation of Schuchert & Cooper (1931 : 71). Skenidioides cf. costatus Cooper (PI. 4, figs. 7-14) Description. Semi-oval Skenidioides with a
. Bulletin of the British Museum (Natural History), Geology. . (°) Fig. 8. The dorsal interior (a) and the ventral internal mould (b) of Rhactorthis crassa gen. et sp. nov., X5 approx.: a, adductor scar ; b, brachiophore ; c, pedicle callist ; d, diductor scar ; m, vascula media ; y, vascula myaria. Family SKENIDIIDAE Kozlowski 1929 Genus SKENIDIOIDES Schuchert & Cooper 1931 Type species. Skenidioides billingsi Schuchert & Cooper by original designation of Schuchert & Cooper (1931 : 71). Skenidioides cf. costatus Cooper (PI. 4, figs. 7-14) Description. Semi-oval Skenidioides with a subpyramidal pedicle valve about three-fifths as long as wide and one-half as deep as long and a very gently convex brachial valve sharply depressed about a median sulcus ; surface essentially costate with, in the pedicle valve, a wide median costa about 0-5 mm. in wavelength 2 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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