Abstract
ABSTRACT The Mouth of McCann's Canyon Site represents an eastern extension of the Harrison Formation (early Miocene: Arikareean) in Cherry County, Nebraska. At least one anuran, one turtle, three lizards, and six snakes are present. The fauna provides the earliest North American records of the modern lizard genus Eumeces, and of the snake family Viperidae. Two new lizards are described: Harrisonsaurus fossilis gen. et sp. n., of uncertain familiar status, and Eumeces antiquus sp. n. of the family Scincidae. The teeth of Harrisonsaurus have bulbous tips separated from the remainder of the crowns by constricted necks. With the exception of a single viperid, the snake fauna is a typical early Miocene one, consisting of five small boids. A cervical vertebra of the extinct boid genus Geringophis is described and figured for the first time.
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