NO. 2127. 



OSTEOLOGY OF THEHCELOBAURUS—GILMORE. 



603 



Femur. — The type has both femora preserved. The femur is 



in Camptosaurus, Laosaurus, and 



■e.c. 



bowed from end to end, as 

 Dryosaurus. It has a sub- 

 globular head borne on a dis- 

 tinct neck. There is a well- 

 developed lesser trochanter on 

 the anterior external angle of 

 the proximal end, being sepa- 

 rated from the upper part of 

 the shaft by a deep vertical 

 fissure. On the outer pos- 

 terior side of this end is a pro- 

 jecting liplike process not 

 before observed on the femora 

 of other orthopodous dinosaurs 

 (fig, 12). 



The distal end has the usual 

 condylar shape, the outer being 

 stronger than the inner. The 

 anterior intercondylar groove 

 is wide and shallow. As with 

 the humerus, the shaft of the 

 femur is twisted, due to the 

 alteration of the aspects of its 

 surfaces. 



On the inner and posterior 

 aspect of the femm* is a tri- 

 angular inner or fourth tro- 

 chanter of the "pendant" 

 type, its apex being directed 

 toward the distal end. It 

 begins above but extends be- 

 low the mid-line of the shaft, 

 as in Camptosaurus. In Hyp- 

 silophodon this process is 

 whoUy upon the proximal 

 haH. 



Measurements. 



mm. 



Greatest length of femur 355 



Greatest diameter of proximal 



end 92 



Greatest diameter of distal end ... 70 



Tilia.— The tibia (fig. 13) in _ _ 



1 fiescelosaurus resembles tnat fkj. 13.— left tibia of THEscEr.osAxmus neglectus 

 of Camptosaurus nearer than gilmore. type. cat. no. 7757, u.s.n.m. i nat. 



.,1 ll . c TT -17 7 SIZE. INTEKNAL ^lEW. O, ASTEAGULXTS; «. C, ENEMIAL 



It does that of Hypsilophodon. crest. 



