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Sturgeons of the Genus Seaphirhynchus 171 <br />'I he folio 'Wing abbreviations are employed to designate the loca- <br />tion of specimens: KU, Museum of Natural History, University of <br />Kansas; SU, Natural History Museum, Stanford University; TU, <br />Department of Zoology, Tulane University; U 11-NIZ, Museum of <br />Zoology, University of Michigan; USN281, United States National <br />T. <br />ACK ORZEDGME_NTS <br />Ile greatly appreciate the assistance of various colleagues, which <br />has materially forwarded this inquiry. Dr. Ethelwynn Trewavas <br />has graciously supplied data on specimens in the British Museum of <br />Natnrai History. We are indebted to the following persons *: , ,,- <br />::: ',on and for the loan of specimens under their care or the pric- <br />ainining them: Drs. Ernest A. Lachner and Leonard P. <br />;cz, United States National _Museum, Dr. Royal D. Suttkus, <br />Tulane University, and Dr. William C. Starrett and Philip W. Smith, <br />Illinois Natural History Survey. For providing records of speci- <br />mens, mostly unpublished, we wish to thank Dr. Margare' <br />University collection), Dr. John D. Black (Arkansas ree- <br />Dr. Carl D. Riggs (Oklahoma record), C. R. Robins (Cornell <br />Urn-rsity collection), and Dr. Milton B. Trautman (Ohio records). <br />Figure 9 was prepared by William L. Brudon, staff artist of the <br />Museum of Zoology, University of Michigan, who has our sincere <br />thanks. Much of the information presented is based on sturgeons <br />seeurPd in the Missouri River in South Dakota during August 1952. <br />)ut the efficient collaboration in the field of Marvin 0. Allum, <br />C. Gibbs, and other staff members of the South Dakota De- <br />partment of Game, Fish and Parks, this undertaking, would have <br />been fruitless. For their help we are most grateful. Dr. C. J. D. <br />" tvn generously contributed a specimen of Scaphirhynchus album <br />frow _Montana. <br />THE RECENT GENERA OF THE ACIPENSERIDAE <br />Scaphirhynchia4 is superficially similar to the Asiatic genus Pseudo - <br />scaphirhynchus Nikolski (1900), as is evident from the figures and <br />accounts of Berg (1904, 1911, 1932, and 1948) and Forbes and Rich- <br />ardson (1905). The two genera have been regarded by Berg as a <br />subfamily Scaphirhynchini (properly Scaphirhynchinae) of the Aci- <br />penseridae; the remaining Recent genera of the family, Acipenser and <br />