34 ON THE ANATOMY OF CHBTSOCHLORIS TREVELTANI. [JftD. 15, 



triangular fibro-cartilage, the ulna is received into a facet formed 

 by the cuneiform and pisiform, and this part of the wrist is shut 

 off from the rest by an antero-posterior septum. In addition to 

 this there is a partial septum which projects into the joint from 

 the anterior ligament opposite the articulation between the scaphoid 

 and semilunar bones. 



The hip-joint on disarticulation in both shows exactly the same 

 arrangement that I have already described and figured in the 

 Armadillo \ The ligamentum teres is present but is continuous 

 along its lower border with the capsule, and the head of the femur 

 shows a vertical notch for its reception instead of a pit. 



The knee-joint has all the characteristics of a generalized mam- 

 malian knee ; the only characteristic thing about it is that the 

 joint is bipartite owing to the great size of the ligamentum 

 mucosum. As in the case of the Brocket Deer, the external 

 condylo-tibial joint is shut out of the main cavity of the knee by 

 the ligament which is attached behind to the crucial ligaments and 

 in front to the origin of the extensor longus digitorum. 



The external lateral ligauient is very strong, and passes from 

 the condyle to the head of the fibula just behind the prominent 

 anterior projection. The crucial ligaments and the semilunar 

 cartilages are those of a generalized mammal. 



There are no tibio-fibular joints. As in most of the Insectivora, 

 the two leg-bones are synostosed above and below. 



The ankle-joint is nearly a perfect hinge ; it consists of tibio- 

 astragalar and fibulo-calcaneal portions. There is absolutely no 

 posterior ligament, as the articular surfaces of the tibia and 

 astragalus are continuous posteriorly with the cartilage- covered 

 surfaces lining the broad groove in which the flexor fibularis 

 tendon plays ; this groove is continued on beneath the sustenta- 

 culum tali. 



There is no articular facet on the anterior border of the lower 

 end of the tibia for articulation with the neck of the astragalus 

 during dorsal flexion of the ankle. 



The external lateral ligament has, as usual in mammals, only 

 two fasciculi ; they correspond to the middle and posterior of 

 human anatomy. The internal lateral ligament has the typical 

 mammalian X-form, the more superficial fasciculus of the X running 

 downward and forward to the navicular, the deeper running 

 downward and backward to the astragalus. 



^ Journal of Anat. vol. xxxiv. p. 305. 



