American terrestrial Rhynchocephalia

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Abstract
The presence of true, strictly terrestrial Rhynchocephalians in America was announced by Gilmore in 1909. Opisthias rarus Gilmore is here figured more fully than hitherto and much of the upper jaw made known. THERETAIRUS antiquus, n. g. and sp., is based on a right dentary, slightly imperfect, from the gray clay of Quarry 9, Como Bluff, Wyoming in the Morrison formation of the Upper Jurassic; type in Yale Peabody Mus. Cat. No. 13764. Theretairus appears to be a member of the Sphenodontia (or Rhynchocephalia vera) but is quite distinct from the better known Homoeosaurus of Europe and Opisthias, also from the Morrison, and is rather less like the modern Sphenodon than are the latter.

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