. Bulletins of American paleontology. . Text-figure 15.—Transverse serial sections of Merista maccuUochensis, n. sp. X 5, USNM 154747 from USNM locality 9046, measuremeints (mm) from ventral beak. foramen not produced; short subangular beak ridges produced in some specimens. Pedicle valve interior with large convex shoelifter process origi- nating in the ventral umbo and becoming broader anteriorly; dental plates short, meeting the shoelifter process above the floor of the valve, except in the beak; cella wider than deep, long, extending anteriorly about one-third the length of the valve.
. Bulletins of American paleontology. . Text-figure 15.—Transverse serial sections of Merista maccuUochensis, n. sp. X 5, USNM 154747 from USNM locality 9046, measuremeints (mm) from ventral beak. foramen not produced; short subangular beak ridges produced in some specimens. Pedicle valve interior with large convex shoelifter process origi- nating in the ventral umbo and becoming broader anteriorly; dental plates short, meeting the shoelifter process above the floor of the valve, except in the beak; cella wider than deep, long, extending anteriorly about one-third the length of the valve. Brachial valve shorter than the pedicle valve, usually consider- ably inflated in the umbonal region; lateral and anterior profiles usually evenly convex, although the dorsum may be slightly de- pressed medially in some specimens; cardinal extremities often slightly compressed in average specimens or evenly convex in more tumid individuals; beak small, incurved, obscured by the pedicle valve. Brachial valve interior with concave hinge plate supported by a high long median septum, extending forward about one-third the length of the valve; simple ridgelike cardinal process produced at the posterior end of the hinge plate; crural bases flat, directed dorso- medially in transverse view, originating on the antero-ventral edges of the inner socket ridges; crura rodlike, spiralia with four whorls, jugum not observed. //o/oty^^.—USNM No. 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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