THE IGUANODON. 



315 



compressed condyles (c,d), 

 which are sejDarated in 

 front and behind by a 

 deep groove (e). Near the 

 middle of the shaft, the 

 mesial, or inner edge, 

 forms a compressed ridge, 

 which extends into an 

 angular projection, or 

 inner trochanter (b). Thus 

 the upper part of the 

 femur may be known by 

 the presence of the upper 

 trochanter (a) ; and if that 

 process is broken away, 

 the fractured surface in- 

 dicating its position will 

 be detected. If a frag- 

 ment of the middle part of 

 the shaft only is found, the 

 flattened angular spaces, 

 and the submedian tro- 

 chanter (b), or the mark 

 libs.jb.-iot FE»m or an- f i ts attachment, will 



iguanodon. From Brook Hay. 



(The original, 40 inches in length.) identify it. The loW T er 

 a, Upper trochanter. 



6. Middle trochanter. extremity of the femur 



c, Inner, rf, outer condyle. . , . . . 



Groove between the condyles. may be distinguished bv 



