152 



Prof. H. G. Seeley on 



terminal fracture was at least Ija inches. The bone appears 

 to have been reconstructed. 



Many other specimens indicate portions of femora, and are 

 catalogued under the numbers 68, 69, 72, 75, 37, 82, 89, and 

 99. Some of these are free from matrix and show the 

 characters of the femur in detail. 



Fig. 4. 



Proximal articulation. 



Trochanter 

 minor. 



Trochanter major. 



Left femur of Palceosaurus. Brist. Mus. no. 68. ^ nat. size. 



No. 68 (fig. 4) is tlie proximal end of a femur which shows 

 both the external and lateral trochanters. The head of the bone 

 is compressed from above downward, flattened superiorly, and 

 more convex on the underside. It is less directed inward 

 than in the type, fully IjV inch broad, and -f^ inch thick. 

 The internal border is concave, the external border convex. 

 At ]yV inch from the proximal end, where the head of the bone 

 has contracted somewhat both in breadth and thickness, is the 

 small external trochanter major, which is a small spur 

 directed upward, scarcely separated from the shaft, suggesting 

 in this respect the similar trochanter in Zanclodon, though in 

 ciiaracters of the head of the bone Paloiosaurus is less Mega- 

 losaurian. The inferior lateral trochanter is in the corre- 

 sponding position to that of Zandodon. It is 2x% inches from 

 the proximal end, and therefore less like Dimodosaurus. 

 The external trochanter is much less distinctly defined tlian is 

 usual in Saurischians. By means of tliree rugosities it 

 extends transversely across the upper surface of the head of 

 the bone. 



No. 69 illustrates the character of the distal end *. The 



Three distinct specimens are indicated under tliis number. 



