. Bulletins of American paleontology. Texas Mississippian brachiopods: Carter 303 o o o 06 88. Text-figure 3.—Transverse serial sections of Shumardella obsolescens Weller. Measurements in millimeters from ventral beak. USNM 154644 from USNM locality 9048. X (Shumard), 1855, which is a larger more strongly costate species. Rhynchonella greenana Ulrich, 1886, from the Borden Group of Indiana is similar in outline and prosopon to S. obsolescens but is much larger, with an extremely gibbous brachial valve, and smooth lateral slopes. Remarks. — Branson's synonymy and discussion
. Bulletins of American paleontology. Texas Mississippian brachiopods: Carter 303 o o o 06 88. Text-figure 3.—Transverse serial sections of Shumardella obsolescens Weller. Measurements in millimeters from ventral beak. USNM 154644 from USNM locality 9048. X (Shumard), 1855, which is a larger more strongly costate species. Rhynchonella greenana Ulrich, 1886, from the Borden Group of Indiana is similar in outline and prosopon to S. obsolescens but is much larger, with an extremely gibbous brachial valve, and smooth lateral slopes. Remarks. — Branson's synonymy and discussion of the author- ship of this species is for the most part correct in that he recognized the dubious nature of Hall's species, Rhynchonella (Eatonia) obso- lescens. He also attributed the species name obsolens to Weller. However, because Weller established the species in 1910 (p. 513) as S. obsolescens, that name must be correct and (according to the code of Zool. Nomenclature) is applied here. Occurrence and abundance. — S. obsolescens is common in the Chouteau Group of Missouri, and according to Branson (1938, p. 52) has been found in all the Chouteau members. In the Chappel Limestone it is common at USNM locality 9045 (72 specimens) and 9048 (40 specimens); but rare elsewhere. There are large collec- tions of this species in the USNM from the Caballero Formation of New Mexico. Family TETRACAMERIDAE Likharev in Rzhonsnitskaya, 1956 Genus ROTA IA Rzhonsnitskaya, 1959. 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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