ANATOMY OF THE PIG-FOOTED BANDICOOT. 71 



the external condyle and joining the tendon of insertion of the 

 extensor communis to the annularis. 



The Extensor carjn ulnaris, unlike its corresponding flexor, is 

 well developed and is inserted into the base of the rudimentary 

 metacarpal bone of the fifth digit (minimus). 



The Supinator hrevis passes as usual from the external condyle 

 to the upper fourth of the radius ; it has only one layer, deep to 

 which the posterior interosseous nerve passes, and no sesamoid 

 bone is developed in its tendon. 



The deep extensors are represented by only one muscle, which 

 rises from the extensor surface of the ulna and joins the extensor 

 communis tendon to the medius ; its large origin is like that of 

 the extensor ossis metacarpi pollicis, while its insertion is that 

 of the extensor profundus, of which the extensor indicis is the 

 only remnant in Man. Probably both these elements have been 

 fused into the single muscle found in Ghoeropus. 



The Muscles of the Palm are very simple and consist of two 

 double-headed flexores breves, one for the medius, the other for 

 the annularis. Dorsal to these there is absolutely no muscle at 

 all, neither are there any adductors superficial to them. 



Muscles of the Trunk. 



The Rectus ahdominis runs from the pubis to the first rib ; no 

 lineae transversse could be made out in it, although they were 

 carefully looked for. 



The Pyramidalis is not well marked ; it rises from the inner 

 side of the marsupial bone and is inserted into the linea alba 

 about one third of the way from the pubis to the xiphisternum. 



The External oblique rises from the fifth to the thirteenth rib ; 

 five linese transversae were seen in it. 



The Supracostalis is present, though small ; it rises from the 

 junction of the second rib with the sternum and runs outward 

 and forward to be inserted into the first rib. 



The Internal oblique and Transversalis are inseparable ; they 

 both help to form the cremaster which runs down on the cord, 

 being specially strong on its outer side, and spreads out to form 

 a well-marked muscular bag for the testis, so that each testis lies 

 in a separate muscular bag. 



The Serratus magnus and Levator anguli scapulce {Serratus 

 ventralis) as usual form one muscular sheet which rises from the 

 lower four cervical vertebrae and from the first eight ribs. 



