Bulletins of American paleontology . FiG. 213. /#%>v. North Carolina Geol. Sur.: Emmons^290 north-carolma geological survey. 199 trie striae ; umbo flattened ; apex sub-acute; inner marginentire. One of the most common fossils of the shell marl. GIBBESII : TUOMEY & HOLlVrES, FOSSILS OF SOUTH-CAROLINA ; p. 74. (Fig. 215.)^i- 215- Shell somewliat triangular, thick, con- centrically furrowed; buccal side rounded;anal side somewhat beaked, angular, witlia longitudinal ridge ; umbones incurved;lunule somewhat excavated.

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