Emerson, William K.2005-10-062005-10-061959http://hdl.handle.net/2246/46758 p. : ill. ; 24 cm.Includes bibliographical references (p. 7-8).1177009 bytesapplication/pdfen-USQL1 .A436 no.1974, 1959Pterorytis.Muricidae, Fossil -- East (U.S.)Muricidae, Fossil -- Mexico.Mollusks, Fossil -- East (U.S.)Mollusks, Fossil -- Mexico.Paleontology -- Neogene -- East (U.S.)Paleontology -- Neogene -- Mexico.Paleontology -- East (U.S.)Paleontology -- Mexico.text