392 DK. B. C. A. WINDLE AND MH. F. G. PARSONS ox THE [-^PI*- 6, 



Ursus americanus (XX,), which is interesting, because that animal 

 has a two-headed biceps and also because in the specimen of Procyon 

 lotor dissected by ns (53) the small coracoid head could be separated 

 by a little tearing from the rest of the muscle and was found to end in 

 the fascia of the forearm. So far as we are able to generalize from 

 the material at our disposal, we should say that in the Carnivora 

 a single-headed biceps inserted into the radius is the normal 

 arrangement, but that the Ursidae are characterized by a double- 

 headed muscle, a condition that is approached by the nearly related 

 Procyonidae, e. g. Procyon lotor (53) and Cercoleptes (61, 62). 



Coruco-hrachialis. — This muscle usually rises by a small rounded 

 tendon from the tip of the minute coracoid process ; it soon becomes 

 fleshy to be inserted into the humerus near its surgical neck, having 

 passed above (over the cephalic border of) the latissimus dorsi 

 tendon (see fig. 8, p. 390). This coraco-brachiahs brevis or rotator 

 humeri was the only part of the muscle seen in the following 

 animals : — Feles leo (1, 1 a), F. tigris (3), F. parclus (5), F. catus (6), 

 F. caracal (8), Cyncdurus jubaius (9), Onjptoprocta (10), Viverra 

 civetta (12, 13, 14), Genetfa{lG), Paradoxurus (21), Herpestes (24), 

 Proteles (25), Hijcena striata (26, 28), H. crocuta (29), Canis fami- 

 liaris (31) (in four other dogs Macalister describes the coraco- 

 brachialis as present, but does not say which parts ; he would 

 probably have made a note had there been anything more than the 

 rotator humeri), Canis aureus (41), Procyon lotor (53, 54, 55), 

 P. canc7-ivoriis (57), Nasua (58, 59, 60, 60«), Cercoleptes (61), Galictis 

 vittata (63). In Straus-Durckheim's cat a delicate tendon rose with 

 the rotator humeri and passed down ventral to the latissimus dorsi 

 to be inserted into the lower third of the humerus just above the 

 supra-condylar foramen (II.). In four specimens of Ursus 

 americanus \4S, 49, 50, 52) a coraco-brachialis longus was present 

 in addition to the rotator humeri ; in one of these Shepherd (XX.) 

 describes the long part of the muscle as being pierced by the 

 musculo-cutaneous nerve, while, in another, Testut (XXIII.) 

 mentions that the brevis was double. In a fifth specimen of the 

 same animal Haughton (XXI.) describes the rotator humeri and 

 then speaks of a coraco-brachialis accessorius, " which," he says, 

 " is like the gemelli " ; whatever may be the exact meaning of his 

 description, it is evident that more than one part of the muscle 

 was present in his case. Both Ursus maritimus (45) and U. arctos 

 (47) resemble the rest of the Bears in having both the brevis and 

 the longus. The Procyonidae, as has been shown, usually have the 

 normal carnivorous arrangement, but Perrin's specimen of Cerco- 

 leptes (62) differed from our own in having the bear-like double 

 muscle. Among the Mustelidse, Galictis barhara (64) and Mustela 

 foina (67) are bear-like. In four specimens of Lut7-a vulgaris 

 (74, 75, 76, 77) the muscle was entirely absent, while in a fifth 

 described by Haughton (XXXIV.) no mention is made of it, though 

 all the surrounding muscles are spoken of. In Lutra cinerea 

 Macalister (XXXVII.) describes the brevis as being present on the 

 left side but absent on the right. In two specimens of Ictonyx 



