ORDER DINOSAURIA. 



1 169 



together ; but this may perhaps be due to a pathological peculiarity 

 of the individual. This genus is regarded by its describer as the 

 type of a distinct family — the Ceratosauridcc. Here may be men- 

 tioned a small and imperfectly known Dinosaur from the Wealden 

 for which the name Aristosuchus has been proposed. The type 

 specimen comprises the sacrum and part of the pelvis. It is con- 

 sidered by its describer that the sacrum includes five vertebras, 

 while the pelvic bones, which have a long ventral symphysis, were 

 originally described as pubes, although it has been subsequently 

 suggested that they may be ischia. The dorsal vertebras referred 

 to this form by Sir R. Owen have a fusiform internal cavity in the 

 centrum, but it has been recently suggested that this reference is 



Fig. 1070. — Left lateral view of skull of Ceratosaums nasicorms ; from the Upper Jurassic 

 of North America. One-sixth natural size, a, Nares ; b, Bony prominence ; c, Preorbital 

 vacuity ; d, Orbit ; e, Infratemporal fossa ; _/", Mandibular vacuity ; t, Transverse bone. (After 

 Marsh.) 



incorrect, and that this genus may have had dorsal vertebrae like 

 those of the Ccehiridce, in which case this form may be referable 

 to Calurus^ in which, indeed, it has been placed by Professor 

 Marsh. 



Family Compsognathid^e. — This family is represented by the 

 small Compsognathus of the Lower Kimeridgian Limestone of 

 Bavaria, and the allied or identical Hallopus of the Upper Jurassic 

 of North America. In the typical genus — known only by a single 

 skeleton — the cervical vertebrae are opisthoccelous, and much longer 

 than the amphiccelous dorsals, and have free cervical ribs. In the 

 limbs the femur is shorter than the tibia, and both the manus and 



