XVIII.] 



MONOTREMATA. 



at each end ; the trochanters are both well developed, and 

 the head placed between them on a very short neck, and with 

 its axis directed quite towards the anterior or dorsal aspect 

 of the bone. The fibula (/') is large and straight ; it has 

 a broad flattened process, completed, by an epiphysis, pro- 



Fir.. 113. — Anterior aspect of bones ot right leg ot OrnithorhyiKhus paradoxus, \. 

 /"femur ; t tibia; /' fibula ; p patella. 



jecting from the upper extremity above the point of articu- 

 lation with the tibia, much resembling the olecranon of the 

 fore limb. The tibia {t) is strongly curved in Ornithorhynchus, 

 but straight in Echidna. In both genera the patella (/) is 

 well developed. 



X 2 



