1903.] O shorn, A Neiv Compsognathoid Dinosaur . 



463 



is much longer than the 



Fig. 3. — Ornii/ioU'stt's hermanni. 

 Amer. Mus. No. 587. X ». Left manus. 



what crushed femur (.207 m.) 

 humerus and somewhat longer 

 than the tibia (.159 m.). The 

 pes has the typical tridactyl 

 arrangement, the phalanges be- 

 ing more rounded and less de- 

 cidedly curved than those of the 

 manus; the median metatarsal 

 measures .117 m. 



Generic and Specific 

 Characters. 



Skull with two antorbital 

 openings ; four premaxillary and 

 ten maxillary teeth, non-serrate; 

 twelve dentary teeth. Four 

 coalesced sacrals. Mid- and 



posterior-caudal vertebrae with greatly elongate zygapophyses; 

 manus narrow with greatly elongate digits, second digit of 

 manus enlarged, fourth digit vestigial, fifth digit wanting. 



Affinities. 



The affinities of the animal are evidently with the light- 

 limbed, slender-jawed group of Theropoda, for which the 

 subordinal name Compsognatha Huxley will probably be 

 found applicable, as distinguished from the large Megalo- 

 sauria. The exceptional rod-like elongation of the pre- and 

 postzygapophyses in the mid- and posterior caudals strongly 

 suggests affinity to Oniithoniiniiis of the Upper Cretaceous. 

 Ornitholestes, however, is a much less specialized form, lack- 

 ing the peculiar compression of metatarsal III which charac- 

 terizes the Cretaceous genus. It is distinguished from the 

 contemporary Ccelurus by the non-serration of the teeth, by 

 the relatively short cervical vertebrae, by the less extreme 

 hollowness of all the vertebrae. From the contemporary 

 Hallopus it is distinguished by the less elongate character of 

 the metatarsals. Comparison with smaller foreign Wealden 



