FORE-LIMB. 135 



clearly shown than in the last specimen. Between the 

 tendons to ill. & iv. there is a fine tendon, inserted partly 

 into tendons in. & iv. and partly into the lumbrical. 

 0. C. 6i M d a. Presented by Victor Horsley, Esq. 



Keith, Nat. Sci., ix. 1896, p. 317.' 



C. 167. Eight arm and half the chest- wall of a Gorilla (Anthropo- 

 pithecus gorilla), showing the superficial muscles. The 

 pectoralis major has a large clavicular origin ; its two parts 

 are separated from each other and from the deltoid by 

 considerable gaps. The epitrochleo-anconeus is fibrous. 

 The flexor carpi radialis has an extensive origin from the 

 oblique line of the radius. The palmaris longus is absent. 

 An extensor pollicis brevis is present. 0. C. 64 N a. 



C. 168. Deep muscles and arteries of the left arm of a Gorilla 

 ( Anthropopithecus gorilla] . The pectoralis minor is attached 

 to the coracoid process in common with the short head of the 

 biceps. The teres major and latissimus dorsi are separately 

 attached to the humerus. Coraco-brachialis brevis is absent. 

 The dorso-epitrochlearis is almost rudimentary ; it joins the 

 extensor antebrachii. The extensores carpi radialis longus 

 and brevis are separate from their origin. 0. C. 64 N b. 

 Keith, Nat. Sci., ix. 1896, p. 28. 



C. 169. Superficial muscles of the right fore-limb of a Chimpanzee 

 (Anthropopithecus troglodytes). The three parts of the 

 deltoid are readily separable from one another. The dorso- 

 epitrochlearis is tendinous for its distal third and extends 

 down to the inner condyle. The coraco-brachialis is remark- 

 able ; it is represented by medius and longus : the longus 

 arises from the inner surface of the short head of the 

 biceps, and has a double insertion, (1) by several fibres 

 into the anterior border of the dorso-epitrochlearis, and 

 (2) into the inter-muscular septum between brachialis 

 internus and extensor antebrachii near the internal condyle. 

 The supinator longus has a two-fold origin from the outer 

 side of the humerus ; the two heads unite about the 

 middle of the fore-arm ; their common tendon is attached 

 close above the styloid process of the radius. The extensor 

 carpi uluaris gives off a small slip to the annular ligament. 



