192 DINOSATJEIA. 



generally with a haemal carina in the anterior part of the series ; 

 posterior dorsals and lumbars with rounded centra, low arches, and 

 less distinct post-zygapophysial pits ; each sacral arch supported 

 by two centra; anterior caudals short, with vertical diameter. of 

 centrum slightly exceeding transverse, posterior ones with longer 

 and compressed centra; rib-facets in anterior and middle dorsals 

 placed on the arch at foot of transverse process. Sternal (?) bones 



Kg. 36. 



1 dispar, Marsh. — The left side of the pelvis. Upper Jurassic, 

 North America, -i-. (From the ' Amer. Journ.') 



12 v ' 



typically hatchet- shaped, with obliquely directed processes. Limb- 

 bones hollow ; scapula (fig. 44) with small glenoidal expansion ; 

 coracoid (fig. 45) with descending process ; humerus long and 

 slender, with small terminal expansions, distinct head, angulated 

 shaft, and prominent condyles. Ilium with postacetabular portion 

 moderately long, and preacetabular portion usually long, slender, and 

 laterally compressed (fig. 39), but occasionally very short (fig. 36), 

 without inner horizontal plate; pubis slender, sometimes shorter 

 than ischium ; ischium long, more or less slender, with a distal 

 expansion ; femur with large inner trochanter, and either slightly 

 longer or shorter than tibia, which is considerably longer than, 

 humerus ; metatarsals more or less elongated and mutually inter- 

 locking ; three or four digits in pes, wbich is digitigrade. Dermal 

 armour generally absent, and never with spines. 



1 Originally Camptonotus, but altered by its founder (Marsh) in ' Amer. 

 Journ.' ser. 3, vol. xxix. p. 169. 



