32 



EK, r. G. PAESOKS ON THE [Jail. 1; 



The gaslrocuemius is as Dobson describes it; there are no 

 fabellse in its heads of origin. 



The plantaris tendon passes under the tuber calcis and is con- 

 tinuous with the flexor brevis digitorum and plantar fascia in the 



sole. 



The popliteus lies, as in most mammals, behind the anterior 



tibial artery. 



The flexor fibularis resembles the flexor profundus digitorum in 

 the fore limb in having its tendon ossified ; in both my specimens 

 there were two sesamoid bones, one at the ankle and another in 

 the sole. 



The flexor tibialis is only imperfectly separated from the last 

 muscle in the calf, and the two tendons fuse in the lower part of 

 the leg. 



The abductor ossis metatarsi minimi digiti is feeble ; while the 

 tibialis posticus, accessorius,and flexores breves agree with Dobson's 

 description. 



There is only one lumbrical, the outermost, in one specimen ; in 

 the other the two outer ones are present. 



Articulations. 



The joints of Clinjsoclihris are in many respects those of a 

 generalized mammal in spite of its extremely specialized fossorial 

 habits. As I have in another place ^ given a description of the 

 joints of mammals, I shall not take up space by drawing attention 

 to the details ^hich this animal shares with other mammals, but 

 shall only mention the points of special importance. 



The temporo-maxillary articulation is a perfect hinge, and the 

 condyle is elongated trans\ersely to fit into a socket bounded by a 

 definite pre- and post-glenoid process. The meniscus is very thin 

 and concave downward. The whole articulation is of the carni- 

 vorous type. 



The sterno-clavicular articulation consists of a short fibro- 

 cartilaginous band which connects the sternal end of the clavicle 

 to the dorsal side of the anterior (cephalic) margin of the pre- 

 sternum. JN'o ossific nodule was present in this band, nor could I 

 make out any synovial cavity between it and the sternum. 



The presence or absence of a synovial cavity at tiie sternum 

 seems to depend very much on the histological structure and con- 

 sequent rigidity of the connection between the bony c]a\icle and 

 the sternum. Tn the Hedgehog, for example, there is a synovial 

 cavity, but then the rod of connective tissue is much more 

 densely chondrified than it is in Chrysocliloris ; indeed, in the latter 

 animal the connecting band between the two bones is so flexible 

 that a synovial joint would be quite superfluous. 



The coraco clavicular hgaments are absent; the acromion is so 

 long and projects so far forward that the clavicle is carried far 



' Joura. Aiiat. vol. xxxiv. 



