230 



KEPTILIA 



CLASS III 



C 



'fr 



serrated anterior and posterior cutting edges. Cervical vertebrae slightly 



opisthocoelous. Femur 1 m. and 

 scapula 0-8 m. long. Hallux directed 

 inward as in Apteryx, and with a com- 

 plete functional phalanx and claw. 

 Abdominal ribs present. Lias to 

 Wealden ; Europe and North 

 America. 



Laelaps, Cope 

 (Dryptosaurus, 

 Marsh). Skull 



and femur each 

 about 0*6 m. long; 

 prefrontal form- 

 ing a superciliary 

 crest; orbit 

 scarcely separated 

 from antorbital 

 vacuity. Teeth 

 and other char- 

 acters similar to 

 Megalosaur u s. 

 Upper Cretaceous; 

 Montana. 



Hypsirophus, 

 Cope ; Ornitho- 

 mimus, Marsh ; 



MegalosauruslucUandi, AllbhlSOcloil, Coel-0- 

 v. Meyer. Bathonian ; J ' . , 



Stonesfield, England. saUl'US, LeiQV. 



Tooth, i/x. Known by frag- 



mentary remains from the Upper Cretaceous of North America. 



Fig. 331. 



Fig. 330. 



Allosaurus agilis, Marsh. Upper Jura; Colorado. 

 Restoration of anterior (A), and posterior (B), limbs, 

 1/20 (after Marsh). 



Family -1. Compsognathidae. Huxley. 



Vertebrae and limb bones hollow. Cervical vertebrae slightly opisthocoelous, post- 

 cervkals amphiplatyan. Neck long unci flexible; cervical ribs styliform. Pubes 

 stout, ischia shorter and more slender. Femur shorter than tibia. Metatarsals 

 long ; manus and pes with three functional digits, the inner and outer ones rudi- 

 mentary. Upper Jura. 



Compsognathus, Wagner (Figs. 332, 333). Represented by a unique 

 skeleton of a fully grown individual from the Lithographic Stone of Kelheim, 

 Bavaria, and preserved in the Munich Museum. It is the smallest known 

 Dinosaur, and interesting in that it contains an embryo within the abdomen, 

 first detected by Marsh. Skull bird-like, about 75 mm. long, its long axis 

 .set at right angles to the relatively long neck. The twenty-two presacral 

 vertebrae have a combined length of 20 cm., and the caudals, of which 

 only fifteen are preserved, measure about the same. Fore-limbs only half as 

 long as the hinder pair. Proximal tarsals tend to form with the tibia a bird- 

 like tibio-tarsus ; astragalus with long ascending process closely applied 



