198 REPTILIA. 



perforate. The pubes project simply downwards and are 

 united in a symphysis distally ; the ischia similarly meet, and 

 the symphysis in both cases is often much extended evidently 

 to serve as a kind of " foot " when the animal rested on its 

 hind quarters. Certain impressions among footprints in the 

 Triassic sandstones of Connecticut suggest this idea. 



Similar Dinosaurs range throughout the Mesozoic period 

 both in Europe and North America, and they are provisionally 

 grouped together under the name of THEROPODA. 



FIG. 119. 



Anchisaurus colurus; restoration of skeleton by 0. C. Marsh, one-twenty-fourth 

 nat. size. Triassic; Connecticut. 



Anchisaurus (figs. 118, 119). Small Triassic Dinosaurs known by 

 nearly complete skeletons. The skull (fig. 118) is remarkably bird-like 

 and the orbit is very large ; the quadrate is much inclined forwards. The 

 teeth are numerous, closely arranged, and nearly uniform. The cervical 

 vertebrae are long and slender ; the dorsals are also elongated but more 

 robust ; the sacrals seem to be three in number. The fore limb is approxi- 

 mately two-thirds as large as the hind limb. The coracoid is remarkably 

 small, without perforation ; and the elongated scapula is about as long as 

 the humerus. The radius and ulna are nearly equal in size. There are 

 five digits in the manus, but only the first three bear claws, the fourth 

 and fifth being rudimentary. The ilium is small, with a slender forwardly- 

 directed process ; the ischium and pubis are long and slender, and the 

 last-named bone is not perforated. The femur is much curved and longer 



