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174 Bailey and Cross <br />that has been overlooked or disagreed with by American worker, <br />until recently. <br />Although album and platorynchus are readily separable and are <br />well- marked species, it is clear that they are closely related and <br />share several fundamental distinctions from the other Root­ n- <br />serids. To separate the two generically obscures their ,16 :; ianco, <br />and we therefore follow Berg in treating them as congeneric. <br />Scaphirhynchus Heckel <br />Aecipenser (in part). — Rafinesque, 1830: S(Y <br />dcipen?er tin part). —Gray, 1834: 1?3. <br />Scaphirhysc ^us.— Heckel, 1836: 71 ioriginal description). GJ,." • ?. },5_ <br />Dumeril. 1870: 368 -369. Kirsch and Fordice, 1890: 246- IT d <br />Eyermann. 1S96b: 107. Berg, 1904: 667. Forbes and Rici:ar•i ;t }, <br />Giltav, 19-29::3. Holly, 1936: 40-41. Type species, by monocy py3 Scaphi- <br />rhynchus ratinesquii Heckel, 1836, a synonym of -Jccipenser platorynchu.4 <br />Rafinesque, 1830. <br />Scal,ir&rhynchus t_yariant of Scaphirhynchus Heckel).— Agassiz, 1846: 333 em- <br />ployed merely to shod- similarity- to Scaphorhynchus Wied. 1531. _ ;enu- ,f <br />birds). <br />Scaphirrhynchus (variant of Scaphirhynchus Heckel).— O'Shaughnes, . <br />Scaphyrhynchus (variant of .Scaphirhynchus Heckell. —Meek, 1895: S9 -93. <br />rphprhinchus (misprint for Scaphirhynchus Heckel).— Zograf, 1896: 199. <br />Scaphirynchus (misprint for Scaphirhynchus Heckel). —Cross and _Moore. 195?: <br />400. <br />Scaphyrhynchops. —Gill. in Hayden, I863: 178 (substitute for Scaphirhynchus Heckel, <br />1836. apparently regarded as preoccupied by Scaphorhynchus M,a <br />L,enus of birds). Type species, by original designation, .S, a, <br />rafinesquii Heckel. <br />Scapi!iritynrhops talso spelled . Scaphirhynhops) (variant of Seaphyrhync ^or Gill). <br />— Jordan and Copeland, 1876: 161. <br />Scaphirynehops (variant of Scaphyrhynchops Gill).— Jordan, 1878c: 33. <br />Scaphirhynchops (variant of Scaphyrhynchops Gill).— Jordan, 1879: 763. .Jordan <br />and Gilbert. 1SS3: S8. <br />Scaphirhyncops (probable misprint for Scaphyrhynchops Gill). — Scudder. 1SS3: <br />385. <br />Parascaphirhynchue.— Forbes and Richardson, 1905: 38. Type species. <br />typy, Parascaphirhynchus albus Forbes and Richardson, 1905. <br />Parascaphirynchus (probable misprint for Parascaphirhynehus Forbes and Rich- <br />ardson) .— Sollas. 1906: 50. <br />Parascaphyrhynchus (variant of Parascaphirhynchus Forbes and Richardson;. — <br />Fowler, 1911: 604. <br />Diagnosis. — Species of Acipenseridae with caudal pedunelt, <br />elongate, notably depressed, and full- armored; rostrum much dac- <br />