Dinosauria Ceratosaurus and Compsognalhus. 15 



downwards and forwards, and unites with its fellow in a long 

 bony symphysis, which generally extends up the anterior face 

 of the two bones, giving them the shape of an elongated letter Y, 

 when seen from the front. The pubis and ischium are com- 

 paratively short and slender. The astragalus, or " ankle-bone," 

 usually fits closely to the tibia, and frequently gives off a long 

 flattened process which is applied closely to the anterior face of 

 the latter bone, resembling in this respect the free condition of 

 these two bones in the young of Ratite birds before the 

 anchylosis of the astragalus with the tibia has taken place. 



The metatarsals are elongated and the feet digitigrade. Tn 

 the manus (hand), the number of digits varies from four to 

 five, while in the pes (foot), there may be either three or five. 

 The terminal phalangeals in all cases have curved claws, which 

 in the manus are very long and prehensile, evidently well 

 adapted for seizing and holding living prey. 



FIG. 17. Left lateral view of skull of Ceratosaurus nasicornis (Marsh), from the Upper 

 Jurassic, North America, a, nasal opening; 6, horn-core; c, antorbital opening; 

 d, orbit ; e, lateral temporal fossa; t, transverse bone ; /, mandibular vacuity (* nat. 

 size) after Marsh. (Not represented in the Collection.) 



The skeleton of a small Dinosaur, of which a beautiful Compsogrna- 

 cast may be seen in Table-case No. 9, the original being tlms> 

 preserved at Munich, named Gompsognathus longipes, has 

 been found entire in the Lithographic stone of Solenhofen. 

 From the relative proportions of its limbs we cannot but con- 

 clude that it must have "hopped (like a Jerboa), or walked in 

 an erect or semi-erect position, after the manner of a bird, to 

 which its long neck, slight head, and small anterior limbs must 

 have given it an extraordinary resemblance." (Huxley.) 



