A new rhynchocephalian reptile from the Jurassic of Wyoming, with notes on the fauna of "Quarry 9"

Charles W. Gilmore
1909 Proceedings of the United States National Museum  
Tlie specimens upon Avliich the present paper is based were collected by parties of the U. S. Geological Survey, working under the direction of the late Prof. O. C. Marsh. Although fragmentary, several of the forms discussed have not hitherto been recognized in the Morrison fauna, and are of additional interest from the fact that they were found in association with the mammal remains from these beds. All of the specimens considered in this article are from " Quarry 9," Como Bluff, Albany
more » ... luff, Albany County, Wyoming, and are now preserved in the vertebrate paleontological collections of the U. S. National Museum. OPISTHIAS, ne>A^genus. The characters of this genus are included in the description that follows of Opisthias varus^the type-species. OPISTHIAS RARUS, new species. Plate 11. Holotyjye.-The nearly complete left dentary with teeth. Cat. No. 2860, U.S.N.M. Parat^ype.-A second dentary from the left side of a somewhat smaller and apparently younger individual. Cat. No. 2858, U.S.N.M. In the collection there are parts of seven other dentaries pertaining I to this form, but the description to follow is based upon the two : specimens mentioned above. Description.-The left dentary of the holotype measures 34.5 mm. i in length, and appears to be complete with the exception of a small I part of the coronoid process. Although somewhat smaller in size, its great resemblance to the dentary of the living Sphenodon is most striking.
doi:10.5479/si.00963801.37-1698.35 fatcat:cjziuo4iajejxehzaxx5jruiby