It turns out that Marsh described them both: http://www.isgs.uiuc.edu/dinos/de_4/5a7f80e.htm http://www.peabody.yale.edu/exhibits/greathall/GH_apato.html http://www.ucmp.berkeley.edu/history/marsh.html http://dinosauricon.com/genera/apatosaurus.html The spurious connection between the missing head and the name is found at http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPaleo5.html -- Curtis Clark http://www.csupomona.edu/~jcclark/ Web Coordinator, Cal Poly Pomona +1 909 979 6371 Professor, Biological Sciences +1 909 869 4062