OP THE MAASTRICHT BEDS. 249 



Fig. 2. — Bight femur of Orthomerus Dolloi. (4- nat. size.) 



pt 

 It \ 



A. Posterior aspect : 1 1, lateral trochanter. 



B. Inner lateral aspect : p t, proximal trochanter. 



C. Outline of proximal end, reversed. 



D. Outline of distal end of another specimen (B. M. No. 42957). 

 a, anterior, p, posterior condyles. 



bone dividing the anterior and posterior surfaces on the distal face of 

 the articulation is about 3 cm. (11 in.). External to the outer of the 

 posterior condyles is a slight ridge, which is rounded and situate 

 behind the middle of the outer side of the bone, so as to make the 

 shorter posterior area markedly concave and to form a slight con- 

 cavity anteriorly. This modification, which is limited to the condylar 

 region, has the effect of giving the outer posterior condyle a compressed 

 aspect, and makes the bone compressed posteriorly. Distally there 

 is a moderate concavity between the condyles from within outward; 

 but the articular surface is imperfectly preserved, though the outer 

 condyle appears to have had the greater distal extension. The depth 

 of the inner condyle is about 6 cm. (2 T 4 T in.). The width across the 

 condylar region, as preserved, is 10 cm. (4 in.). The antero-posterior 

 measurement cannot be given. Above the condyles the distal end of 



