104 



GREGORY: NOTHARCTUS, AN AMERICAN EOCENE PRIMATE 



by a compressed ridge. Both the inner and the outer facets respectively articulated with the great 

 sesamoids which were imbedded in the fibrous plate, on the plantar side of the capsule enclosing the 

 metatarso-phalangeal joint. These sesamoids also gave insertion to the inner and outer tendons of the 



3 2 1 



Fi-. 24. Muscles of the hiiul liinh of Lninn: After ( in ier and I.aurillard. 



1. Outer side, superficial muscles. 



2. Outer side, after the removal of vastus externus and bicep.s. 



3. Inner side of thigh and leg. 



.Wjbreviations 



a 



gluteus maximus + agitator cauda; 





gastrocnemius 





gluteus medius 



<? 



soleus 



i 



iliacus 



5 



tibialis anticus 





pectineus 



5' 



tibialis posticus 



/, 1 



adductors 



t 



peroneus longus 





vastus externus 





peroneus brevis 



0 



crureus 





extensor quinti digiti brevis 



P 



rectus femoris 



f 



extensor digitorum longus 



? 



biceps 



n 



abductor hallucis 



r 



semitendinosus 





flexor brevis digitorum 





semimembranosus 





adductor obliquus hallucis 



i 



sartorius 





adductor transversus hallucis 



u 



gracilis 



IT 



lumbricales 



powerful flexor brevis hallucis muscle. (Fig. 25.) The articular surface of the median ridge between 

 the sesamoids was worn smooth by the movement of the fibrous plate itself. 



The proximal end of the first phalanx is also asymmetrical, being produced into a shorter process 



