ANATOMT OF THE PIG-JFOOTED BANDICOOT. 65 



In the wrist-joint the ulna hardly takes any part, the 

 articulation is between the radius above and the scaphoid, semi- 

 lunar, and cuneiform below, but there is a slight joint-cavity 

 completely shut off from the rest between the ulua and the 

 pisiform. 



In the hip the ligamentum teres is well marked. 



The knee is like that of most other mammals, the posterior 

 attachment of the external semilunar cartilage is to the inter- 

 condylar notch of the femur, while the head of the fibula shows 

 none of the freedom of movement so characteristic of many 

 other marsupials *. In this typical mammalian knee Chceropus 

 agrees with Perameles and differs I'rom many other marsupials. 



The internal lateral ligament of the ankle consists of tibio- 

 navicular and tibio-astragular bundles, while on the outer side 

 the middle and posterior fasciculi of the external lateral liga- 

 ment are present. As the tibia and fibula become synostosed 

 in the lower half of the leg, there is no inferior ti bio-fib ular 

 articulation. 



The Muscles. 



Panniculus carnosus. — This is well developed and has the 

 typical mammalian arrangement t. The abdomino-humeral part 



Fig. 1. 



1. Platysma. 2. Sphincter colli. 3. Retractor naris. 4. Orbicularis 

 palpebrarum. 5. Frontalis. 6. Anterior auricular muscles. 



is very well developed and, as usual, divides to euclose the 

 pectoralis, but the part which passes superficial to that muscle 



* " Joints of Mammals," Journ. of Anat. vol. xxxiv. p. 312. 

 t " Muscles of Mammals," Journ. of Anat. vol. xxxii. p. 428. 



5* 



