82 PHYSIOLOGICAL SERIES. 



B. 159. Right hip-joint of a Chimpanzee (Anthropjpithecus 

 troglodytes), showing the ligamentum teres. 



B. 170. The parts constituting the Human hip-joint of the right 

 side. 



The anterior part of the capsular ligament is turned back 

 to show the extent to which the synovial membrane is 

 reflected over the anterior part of the neck of the thigh- 

 bone ; the thickness of the ligamentous part of the capsule 

 is also shown by the section. In the cotyloid cavity may 

 be observed the ligamentum teres, round which a bristle is 

 tied, and the depression containing the fatty and synovial 

 substance. 0. C. 256. Hunterian. 



KNEE. 



B. 171. The parts constituting the knee-joint of an Ostrich (Stru- 

 thio camelus), injected. 



A section has been made through the patella, and the 

 anterior part of the joint is laid open to show the crucial 

 ligaments, and a very large tendon passing through the 

 joint to be attached to the front of the external condyle ; 

 also a tendon passing through a synovial sheath in the 

 ligament of the patella, in an oblique direction from the 

 femur to the tibia. Posteriorly, the capsular ligament is 

 removed, to show the semilunar cartilages and the ligament 

 connecting the external one to the head of the fibula, which 

 in this class of animals is articulated with the external 

 condyle of the femur, and forms part of the knee-joint. 



The blood-vessels upon the inner condyle are successfully 

 filled, and exhibit numerous mutual anastomoses as they 

 approach the articular cartilage, forming what Dr. Hunter 

 termed " the Circulus articuli vasculosus ; the vascular 

 border of the joint." 0. C. 272. Hunterian. 



B. 172. The parts constituting the knee-joint of the Ornitho- 

 rhynchus anatinus. 



The articular cavity is divided into two compartments 

 by a continuation and extension of the ligamentum mu- 

 cosum from the back of the patella to the crucial ligaments; 



