Gordon, Myron, 1899-1959.Rosen, Donn Eric, 1929-2005-10-062005-10-061951http://hdl.handle.net/2246/984p. 413-464, [2] p. of plates : ill., map ; 27 cm.Includes bibliographical references (p. 460-464).14623654 bytesapplication/pdfen-USQH1 .A4 vol.95, art.7, 1951Xiphophorus -- Genetics.Xiphophorus -- Generative organs -- Morphology.Xiphophorus -- Morphology.Generative organs, Male -- Morphology.Swordtails (Fish) -- Genetics.Swordtails (Fish) -- Morphology.Genetics of species differences in the morphology of the male genitalia of xiphophorin fishes. Bulletin of the AMNH ; v. 95, article 7Genetics of fishestext