. The Cambridge natural history. Zoology. THEROPODA 421. Fig. 98.—Skull of Anchisauriis coelurus. x\. (After Marsh.) a, Nasal fossa ; 6, antorbital. c, infra-temporal, d, supra- temporal, ando, orbital fossa; q, quadrate bone. from its foot-spoors only, which, together with other three-toed spoors in the sandstone of the Connecticut valley, were originally described and figured by Hitchcock as Ornithichnites (t'xi'o? = track, or spoor). Some of these imprints are more than a foot, in length, the right and left spoors following alternately at a dis- tance of from four to six feet. In some cases
. The Cambridge natural history. Zoology. THEROPODA 421. Fig. 98.—Skull of Anchisauriis coelurus. x\. (After Marsh.) a, Nasal fossa ; 6, antorbital. c, infra-temporal, d, supra- temporal, ando, orbital fossa; q, quadrate bone. from its foot-spoors only, which, together with other three-toed spoors in the sandstone of the Connecticut valley, were originally described and figured by Hitchcock as Ornithichnites (t'xi'o? = track, or spoor). Some of these imprints are more than a foot, in length, the right and left spoors following alternately at a dis- tance of from four to six feet. In some cases the long trailing tail has left a furrow behind, and the large tracks are accom- panied or crossed by much smaller, and even by quite tiny tracks, otherwise similar, and undoubtedly made by the young. Anchisaurus, from the same locality, was still Sauropodous, in so far as the metatarsals are still free, with two, three, four, and five phalanges on the first four toes, but the fifth metatarsal is re- duced, carrying a vestige of only one phalanx, and the proximal tarsal bones are fused with the tibia and fibula respectively. Total length some seven feet, of which about four belong to the tail. Zanclodon, from the Keuper of "Wiirtemberg, about ten feet long, with pentadactyle hands and feet. Ischia stronger than the pubic bones, which are distally much broadened. The femur is nearly three feet long, and possesses a fourth trochanter. The astragalus has an ascending process, and is fused with the tibia. The toes are short, strong, and clawed. The shoulder-girdle and fore-limb are strong, the latter well adapted to grasping. The teeth are much compressed laterally, with sharp, finely serrated edges. Several allied genera have been described from the Upper Trias of France and England ; others from corresponding strata of India and South Africa. Megalosaurus, from the Trias to the Wealden in England and France, with other species in Colorado and India, reached a considerable
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