Smithsonian miscellaneous collections . minent, the metapophyses rising nearly as stronglyas the spine. Lumbar vertebrae of Trogosus are not known but those of Es-thonyx, if correctly associated, show these vertebrae to be decidedly NO. 10 TILLODONTIA—GAZIN 73 elongate, and with the centra dorsoventrally somewhat flattened. Thetransverse processes are slender, flattened, and strike forward fromthe upper portion of the centrum. The anterior zygapophyses facemedially and are strongly concave. The spine between them is trans-versely compressed and rises forward over about the anterior half ofthe
Smithsonian miscellaneous collections . minent, the metapophyses rising nearly as stronglyas the spine. Lumbar vertebrae of Trogosus are not known but those of Es-thonyx, if correctly associated, show these vertebrae to be decidedly NO. 10 TILLODONTIA—GAZIN 73 elongate, and with the centra dorsoventrally somewhat flattened. Thetransverse processes are slender, flattened, and strike forward fromthe upper portion of the centrum. The anterior zygapophyses facemedially and are strongly concave. The spine between them is trans-versely compressed and rises forward over about the anterior half ofthe length of the vertebra. The lower surface of the centrum is trans-versely compressed to form a slight keel, but without significant de-velopment of a hypapophysis. A series of 14 caudal vertebrae (fig. 26), apparently in articulationand probably incomplete at both ends, belong to the Trogosus grangeriskeleton. These are broad and robust, showing that Trogosus had along and heavy tail. Those preserved increase in length from the first.
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
