670 MR. F. E. BEDOARD C» T BASSARICYON ALLEN'I. [June 10, 



to it. The chief facts about its origin to be noted are that it does 

 not extend back as far as the ilium, and that part of its origin is 

 from the last three ribs ; it joins the teres at insertion which forks 

 over the head of the biceps. 



The Trapezius presents no particular features of interest ; it is 

 attached largely to nearly the whole length of the spine of the 

 scapula ; and there is also the cephalo-humeral portion which 

 passes down the arm but is inserted on to the humerus as in other 

 Arctoids. 



The Omotrachelian is of course present and attached jnst in front 

 of the last-mentioned muscle. 



The Dorso-epitrochlear is slender and strap-shaped. 



The Deltoid calls for no special remark. It is composed of two 

 portions as in other Carnivora (not counting the cephalo-humeral). 



The Triceps consists of four distinct portions which can be 

 referred to this muscle, and possibly of a portion whose nature is 

 somewhat doubtful and with which we shall deal presently. 



The two outer heads are thick muscles which blend with each 

 other not very far from their insertion on to the elbow. Their 

 origins are concealed by the two divisions of the deltoid. The 

 posterior of the two arises from the margin of the scapula near to 

 the glenoid cavity. The origin of the anterior is from the head of 

 the humerus. These two divisions are superficial to a deeper 

 stratum of the triceps. This latter consists of the two portions 

 that appear to exist in other Carnivora. Of these one arises just 

 under the anterior superficial head and joins about halfway down 

 the humerus the fourth head, which arises from the upper part of 

 the shaft of that bone. 



A broad slip of muscle, which appears to correspond to the 

 second dorso-epitrochlear of some authors, arises superficially from 

 the tendinous junction of the latissimus dorsi and the tei^es major, 

 and therefore considerably above the origin of the undoubted dorso- 

 epitrochlear. It is a flat strap-shaped muscle, and is inserted much 

 nearer to the elbow-joint than the dorso-epitrochlear. 



The Anconazus is a fleshy mass arising from the lower half of 

 the humerus, and inserted on the same level as the deep portion 

 of the triceps. 



The Epitrochlio-an connns was found. 



The Supinator longus is present, as in all Arctoids and the 

 majority of the Carnivora. 



The Extensores carpi radiales longior et brevior are completelv 

 blended and indistinguishable at their origin. Concerning the 

 Extensor carpi ulnaris, Extensor communis digitorum, Extensor 

 minimi digiti, I have no remarks to offer. 



The Extensor digitorum profundus arises from the dorsal surface 

 of the ulna only. 



The Extensor ossi metacarpn pollicis arises as in other Carnivora 

 from both radius and ulna. 



The Pronator radii teres appears to have an exceptional arrange- 

 ment in Bassaricyon. As a rule in this group of Arctoids the 



