ANATOMICAL STUUCTURE OF ANTHiiOPOID APES. 165 



two portions of the pectoralis minor; it was con- 

 iieeted for a space with the coraco-brachialis, and 

 finally it was attached, in the upper part of the lower 

 third of the humerus, to the inter-muscular septum 

 which is found between the brachialis anticus and 

 the triceps. In the chimpanzee, on the other hand, 

 it has its origin in the latissimus dorsi, and divides 

 into an anterior and posterior portion ; the former is 

 attached to the inner condyle of the humerus, while 

 the latter is connected either with the middle or 

 inner head of the triceps. In the orang the same 

 division of this muscle may occur. In one of these 

 animals I observed an anterior portion, very thin and 

 semi-membranous, attached by an extremely slight 

 tendon to the coracoid process of the shoulder-blade, 

 while the hind portion issued from the latissimus 

 dorsi. They were both in connection with the triceps 

 and brachialis anticus. In other instances the 

 muscle consisted only of the posterior portion, 

 issuing from the latissimus dorsi. In the white- 

 handed gibbon, the muscle issued from the region 

 in which the tendons of the latissimus dorsi and of 

 the teres major are united, and was inserted into 

 the fascia which is found between the bicipital and 

 the brachialis anterior. This attachment may also 

 occur in the centre of the shaft of the humerus. 

 Chapman and Chudzinsky have observed anomalous 

 instances of this formation in coloured races.* 



It is well known that in man the biceps is in- 

 serted into the tuberosity of the radius by means of 



* Proceedings of the Academy of Natural Sciences of Phila. 

 delphia, 1879. Revue d' Anthropologic, 1873, 1874. 



