LAGOMORPHA. 879 



anterior half by a well-defined fossa. The g'eneral form of the ilium is slender. 

 The ilioischiatic suture traverses a concave face behind the acetabulum. The 

 rim of the latter is pronounced. The posterior face of the femur between 

 the little and third trochanters is nearly plane ; it is strongly convex on the 

 anterior face. The shaft below the middle is a transverse oval drawn to an 

 obtuse angle at one extremity, on account of the upward prolongation of 

 the angle defining the posterior face. The latter at its inferior part is 

 divided by an obtuse longitudinal ridge which extends to the intercondylar 

 fissure. The condyles exhibit about equal length and width, and their 

 articulating surfaces are not distinctly cut off from that of the patellar groove. 

 The external fossa; are very insignificant. The iimer cotylus of the head 

 of the tibia is only about half as wide as the external. The spine, which 

 limits it towards the middle line of the head, is separated by a wide interval 

 from the inner margin of the external glenoid cavity. The external notch of 

 the head, though small, is well-defined. Just above the point of attachment 

 of the distal extremity of the fibula the tibia is triangular in section, the 

 longest side being the inner. Half-way between this point and the distal 

 extremity, the section of the shaft is a transverse oval. As we approach 

 the extremity, two angular lines appear on the posterior face, near the 

 borders, which extend, the one to the external border of the external mal- 

 leolus, the other to the opposite border of the inner malleolus. Each incloses 

 a narrow groove with the margins of the tibia, which terminate on each side 

 of the distal extremity in a small backwardly directed process. The sur- 

 face between these lateral ridges is gently concave. On the anterior face 

 the border of the distal exti-emity is convex forwards. Above the extremity 

 the face is concave, and near the inner border a little further up is a short 

 groove-like fossa separated from the border by a little ridge. Both of these 

 concavities are diflferently developed in different individuals, and arc some- 

 times obsolete. 



Me€isurem€nts. 



M. 



Width of humerus at middle of shaft 0025 



Width of humerus at condyles 0062 



_. . iM. J i? J- < transverse 0050 



Diameter of head of radius < . , „^^„ 



( vertical 0028 



Diameterof shaft of radius distally 0028 



Length of ilium (proximally restored) 0190 



