. The Devonian of Missouri. Geology; Geology, Stratigraphic; Paleontologie; Devoon. BRACHIOPODA. 89. Sections of Pentamerellas. 1-5. Pentamerella arata (Conrad). Sections of a small specimen from the Mineola . The brachial valve was 11}^ mm. long and the sections were made 1 mm., 3 J/2 mm., mm., 4 6 mm. and mm. from the beak. The septae continue for less than one millimeter in front of the last section. 6. Pentamerella arata (Conrad). Section near the beak of a specimen from the Jeffersonville beds of Indiana. 7-12. Pentamerella fultonensis Branson. Sections of a specimen with a brachi
. The Devonian of Missouri. Geology; Geology, Stratigraphic; Paleontologie; Devoon. BRACHIOPODA. 89. Sections of Pentamerellas. 1-5. Pentamerella arata (Conrad). Sections of a small specimen from the Mineola . The brachial valve was 11}^ mm. long and the sections were made 1 mm., 3 J/2 mm., mm., 4 6 mm. and mm. from the beak. The septae continue for less than one millimeter in front of the last section. 6. Pentamerella arata (Conrad). Section near the beak of a specimen from the Jeffersonville beds of Indiana. 7-12. Pentamerella fultonensis Branson. Sections of a specimen with a brachial valve 14 mm. long. The sections were made mm., mm., mm., 5 mm., mm. and mm. from the beak. All sections are arranged in series with the smaller numbers nearer the beak. Genus Gypidula Hall Gypidula manonensis Greger Plate 16, figures 17-20. 1920. Gypidula marionensis Greger, Am. Jour. Sci., vol. 50, p. 24. Description—Shell small subglobose, the pedicle valve much more convex than the brachial. In old specimens the convexity of the pedicle valve is proportionately much greater than in young specimens. The beak of the pedicle valve is strongly in- curved but ordinarily not overlapping the beak of the brachial valve. A very short median septum. The shell is smooth and has no indication of fold or sinus. The brachial valve is much less convex than the pedicle. It is smooth and has no fold or sinus. The crural plates and septae extend about half the length of the valve and are nearly parallel, though the septae converge to form a point at their anterior end. The dimensions of an average specimen are: Length 10 mm., width 9 mm., thick- ness mm. A specimen with an unusually large pedicle valve measures: Length 9 mm., width 10 mm., thickness 12 mm.; in this specimen the height of the pedicle valve is 9 mm. The distinguishing feature of this species are its smoothness, small size, and unusual height of the pedicle valve. Greger published no description or f
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