the Chimpanzee and others of the Primates. 349 



The sartorius is long, but normal; the rectus has but its straight 

 single origin ; and the parts of the quadriceps are thus re- 

 lated: — vastus externus = 13, rectus = 5, and the combined 

 vastus internus and crureus =14. There is no subcrureus. 

 The biceps is arranged as in man. The semitendinosus pre- 

 sented its usual inscription; and the semimembranosus was, as 

 described by Prof. Humphry, quite separate from the fascia. 

 These hamstrings are developed in the following propor- 

 tions : — biceps ischiaticus = 2, femoralis = 6, semimembra- 

 nosus = 1^, semitendinosus = 2^. The femoral biceps nearly 

 equals the vastus externus, and the ischiatic equals the rectus ; 

 the gracilis is larger than the semitendinosus. Altogether the 

 flexors of the knee by weight are to the extensors as 150 to 

 100. 



The popliteus was small, and had no sesamoid nodule in its 

 tendon, thereby agreeing with Wilder's and differing from 

 Vrolik's specimen. Traill did not find it present. The gas- 

 trocnemius internus was to the externus as 8 to 5 ; they were 

 separate as far as the tendon ; they were not quite fleshy to 

 the heel, as Wilder found them. There was no tibial head of 

 the sol^eus ; but the fibular origin of this muscle was very large. 

 Prof. Humphry found in one Chimpanzee that it was reduced 

 to a small musculo-tendinous slip from the head of the fibula ; 

 and the same is described by Prof. Huxley {L c. p. 429). The 

 former author found a distinct tibial head to the solteus in a 

 Chimpanzee. The plantaris was extremely fine and its ten- 

 don was inserted separately into the os calcis on the left side ; 

 on the right it was absent. This was just the contrary of 

 the arrangement seen by Wilder, who found the muscle sup- 

 pressed on the left and present on the right. Vrolik also 

 found it, and so did Huxley and Humphry, while Traill reports 

 its absence. 



The tibialis anticus is double, one tendon being inserted into 

 the scaphoid and one into the entocuneiform and the metatarsal 

 bone of the hallux ; this has been noticed by Vrolik, Wilder, 

 Humphry, and Wyman. The extensor digitorum sends a 

 tendon to all the toes, as Wilder found. The peronseus tertius 

 was absent, as it is in all the Quadrumana, the so-called 

 perongeus tertius of Wyman in the Howling Monkey being a 

 peron^eus quinti. The other peronsei were anthropoid. The 

 extensor hallucis was normal, as also was the tibialis posticus. 

 The flexors were as described by the various authors. 



In the dissection I carefully sought for the various nerve- 

 arrangements, and found in them few varieties which were 

 not anthropoid ; the disposition of the cervical plexus, the 

 phrenic and vagus nerves were just as in man ; the anterior 



Ann. & Mag. N. Hist. Ser. 4. Volxn. 25 



