1896.] ANATOMY OF PETROGALB XANTHOPUS. 687 



towards the head at their ends ; tliey are small on tlie 1st and 2nd 

 vertebras, but rapidly increase afterwards. 



The anapophyses begin on the last three thoracic vertebra) and 

 disappear on the last two lumbar. 



Fic. 3. 



lat lumbar vertebra of Feirogale, with bjpapophysis (IT). 



The Clavicle has the usual single foru'ard ciu've. The Scapula 

 resembles that of Maoropus in the abserice of any sign of a 

 metacroraial process ; a small inetacromion is, however, found in 

 Hyijsii^rymnus. 



The Humerus is chiefly remarkable in that it shows all or almost 

 all the centres of ossiiication ; they consist of the following: — 

 l,head; 2, greater tuberosity ; 3, lesser tuberosity (quite distinct); 

 4, shaft; 5, internal condyle; 6, trochlea and capitellum ; 

 7, external condyle. The centre for the internal condyle takes no 

 part in the bridge of bone enclosing the supra-condylar foramen. 



The Radius and Ulna show all the epiphyses, but that for the 

 upper end of the radius is nearly united to the shaft. The upper 

 epiphysis of the ulna merely forms a cap to the olecranon. 



The Carpal bones correspond to Owen's description. 



In the Pelvis the three parts of the os iuuominatumare completely 

 .fused, but there is an epiphysis ou the crest of the ilium and on 

 the tuberosity of the ischium, the latter stretching along as far as 

 the subpubic bone, with which in more adult auimals it coalesces; 

 there is also a shght ossific deposit in the centre of the pubic 

 symphysis. No special centre is seen for the origin of tlie rectus 

 femoris. 



The Femur shows the following epipbyses : — 1, head ; 2, great 

 trochanter; 3, upper part of lesser trochanter; 4, shaft; 5, lower 

 extremity. The epiphyses for the head and great trochanter meet 

 on the upper surface of the neck. The outer side of the posterior 

 part of the external condyle is lipped and forms a groove for the 

 reception of the elevation on the posterior part of the head of the 

 fibula during extreme flexion of the kuee-joiut. The Patella is 

 almost entirely cartilaginous, but a small bouy deposit is seen in 

 the centre. The l^ibia shows the following centres ; — 1, head ; 

 2, upper part of cuemial crest where the ligamentum patellae is 

 attached ; 3, shaft ; 4, lower extremity. In studying the ossifi- 



