544 O. C. Harsh — Notes on Triassic Dinosauria. 



use at one time. Those of the upper jaw are inclined forward, 

 while those below are nearly vertical. The lower ja-w has the 

 same general features of this part in the Therqpoda. 



In Plate XVI, figures 1 and 2, the same skull is shown, also 

 one-half natural size. The top of the skull, represented in 

 figure 1, is considerably broken, and this has made it difficult 

 to trace the sutures, but the general form and proportions of 

 the upper surface are fairly represented. In figure 2, only 

 the back portion of the cranium is shown. The foramen 

 magnum is remarkably large, and the occipital condyle is small 

 and oblique. The basipterygoid processes are unusually short. 



The neck vertebrae are long and slender, and very hollow. 

 Their articular ends appear to be all plane or slightly concave. 

 The trunk vertebrae are more robust, but their centra are 

 quite long. The sacrals appear to be three in number. 



The scapular arch is well preserved. The scapula, shown in 

 Plate XV, figure 2, s, is very long, with its upper end obliquely 

 truncated. The coracoid (c) is unusually small, and imper- 

 forate. The sternum was of cartilage, some of which is 

 preserved. The humerus (A) is of the same length as the 

 scapula, and its shaft is very hollow. The radius and ulna are 

 also both hollow, and nearly equal in size. 



There is but one carpal bone ossified in this specimen, and 

 this is below the ulna. There were five digits in the manus, 

 but only three of functional impdrtance, the first, second, and 

 third, all armed with sharp claws. The fifth (V) was quite 

 rudimentary. The fore foot of the type species of Anchi- 

 saurus is shown one-half natural size, on Plate XVI, figure 3. 



The pelvic bones are shown in figure 3 of Plate XV. 

 The ilium (il) is small, with a slender preacetabular process. 

 The ischia (is) are elongated, and their distal ends slender, and 

 not expanded at the extremity. The pubes (p) are also long, 

 imperforate, and not coossified with each other. The anterior 

 part is a plate of moderate width. The ischia of the type 

 species of this genus are shown on Plate XVII, figure 6. 



The femur (f) is much curved, and longer than the tibia (t). 

 The latter is nearly straight, with a narrow shaft. The fibula 

 if) wnen i n position was not close to the tibia, but curved out- 

 ward from it. All these bones have very thin walls. The 

 astragalus (a) is small, closely applied to the tibia, and has no 

 ascending process. The calcaneum (c) is of moderate size, and 

 free. There are only two tarsal bones in the second row. 



The hind foot had four functional digits, all provided with 

 claws. The fifth was represented only by a rudiment of the 

 metatarsal (V). The first digit was so much shorter than the 

 second, third, and fourth, that this foot would have made a 

 three-toed track very much like the supposed Bird-tracks of 

 the Connecticut River sandstone. 



