574 



Dr. C. W. Andrews on a Therjpjdous 



border, pi'obably reaching the upper angle of the inner 

 condyle, but the distal portion is incomplete. The fourth 

 trochanter (4 tr.^ forms a very prominent ridge on the 

 upper part of the posterior face of the shaft ; on its inner 

 side there is a large, slightly concave roughened area for the 

 attachment of muscle. The lower end of this trochanteric 

 ridge is at about the middle of the shaft. As already 

 mentioned, the distal condyles are wanting, but it can be 

 seen that, even allowing for expansion due to crushing, the 

 distal articulation must have been a fairly wide one. The 

 walls of the bone are relatively very tliiUj the central 



Fio-. 2. 



A. 



A. Upper end of femur of Sarcosaurtis tcoodi, from inner side ; B, Ditto 

 from outer side ; C, Anterior face of imperfect dorsal vertebra. 

 \ nat. size. a.z., anterior zyg-apopliysis ; d.p., diapoplijsis ; 

 g.tr,, great (anterior) trochanter-; ?«., broken surface of neck of 

 femur ; n.c, neural canal ; ^j., pit at upper end of femur ; t.s., 

 trochanteric shelf; 4 <;•., fourth trochanter (imperfect). 



cavity being large ; thus in the middle of the shaft, where 

 its diameter is about 35 mm., the thickness of the bony 

 wall is only between 4 and 5 mm. Towards the proximal 

 end of the bone a fracture shows that the central cavity 

 was divided up by irregular septa of bone. 



The anterior half of a vertebra (fig. 2, C), -apparently 

 from the posterior dorsal region, is preserved. The neural 

 arch, with part of one of the diapophyses and the anterior 

 zygapophyses are present, but the neural spine is wanting. 

 The anterior face of the centrum is very slightly concave. 

 Its upper border beneath the neural canal {n.c.) is nearly 



