OCR Text |
Show 394 DR. B. C A. WINDLE AND MR. F. G. PARSONS ON THE [Apr. 6, Laurillard (XIX.). In the Ursidae there are three heads in U. marltlmus (45), four in U. americanus (49). Among the Procyonidae, Procyon has already been alluded to. Cercoleptes (61) has four heads. The Mustelidae are remarkable for having an extra head, rising from the angle of the scapula and joining the rest of the muscle in the lower part of the arm, to be inserted into tbe inner side of the olecranon. This head was noticed in Galictis vittata (63), 67. barbara1 (64), Mustela putorius (65), M. foina (66), Ictonyx lyhica (70), Meles taxus (7z), and Lutra vulgaris (74, 75, 76). The insertion of the triceps is into the upper internal and external surfaces of the olecranon process. Anconeus.-This muscle is large and triangular and is always closely connected with the lower part of tbe triceps: its base rises from the back of the external condyle and supracondylar ridge, while the truncated apex is inserted into the outer side of the olecranon process. The muscle is evidently present in all the Carnivora, and only varies in size and in the degree of its fusion with the triceps. Epitrochleo-anconeus (Anconeus internus).-The epitrocbleo-anconeus is a most constant muscle iu Carnivora. It is described by Gruber in a good many animals besides those in our list. It is a round muscle which passes from the back of the internal condyle to the inner side of the olecranon, lying superficial to the ulnar nerve by which it is supplied. Pronator radii teres.-This muscle rises from in front of, and just above, the internal condyle and passes obliquely to the side of the radius farthest from the ulna. There is never any sign of a deep head. The position of the insertion of the muscle seems to be of some interest from a systematic point of view. In the Felidae it is inserted about the middle of the radius in F. leo (la), F. tlgris (3), and F. catus (6). In Cyncelurus, Ross (IV.) describes it as reaching to within 2 inches of the lower end, and from its insertion a small tendinous prolongation extends to the palmar fascia. In the Viverridae the insertion is rather variable; in Cryptoprocta (10), Viverra civetta (12), and Hemigalea (XI.) it goes to the lower half, while in Viverra civetta (13), Genetta (17,18), and Herpestes (24) it goes to the middle. In Proteles (25) it is very small and is inserted about the middle. Among the Hyaenidae, Hyceiui striata (26, 27, 28) and H. crocuta (29) closely resemble Proteles. In the Canidae the muscle is small and is usually inserted above the middle of the radius ; this is the case in Cams familiaris (31, 39), C. aureus (41), and C. vulpes (42), while in Lycaon pictus (44) it goes to tbe middle. In the Ursidae we have records of three specimens of Ursus americanus (48, 49, 52) and one of U. arctos (47); in all of these the insertion was into the lowrer end of the radius. Among the Procyonidae it went to the middle of the radius in three specimens of Procyon (53, 54, 57), but Meckel describes it as going to the lower end of the bone in that animal (XXXIX.). 1 Vide description of Dorso-epitrochlearis on p. 38G. |