1897.] MYOLOGY OF THE TEBEESTEIAL CABNITOKA. 403 



(64), while ia Miistela putorius (65) and Lutra (74, 77, 78) it 

 reaches as low as the third quarter. In Meles (72, 73), however, 

 it only goes as far as the middle ot the radius. 



Extensor ossis metacarjn poUicis. — This muscle is always present 

 in Carnivora and is constant in its attachments : it rises from the 

 dorsal surfaces of the radius and ulna, especially the latter, and is 

 inserted into the base of the metacarpal bone of the poUex and 

 often into the radial sesamoid bone near it. In Procifon. lotor (53) 

 and GalicLis harhara (64) slips were given to the trapezium. h\ 

 the former animal and in Viverra civetta (12) the highest fibres 

 rose as far up as the olecranon. 



Extensor cUgitoriim profundus. — Instead of describing the 

 extensor secundi iuternodii pollicis and extensor indicis as two 

 separate muscles, we have found it more convenient to follow the 

 example set iu Bronn's ' Thierreich '' and to speak of them imder 

 the above heading. We do not propose to include the extensor 

 ossis metacarpi pollicis with the other two, as it is not an extensor 

 of a digit but of a metacarpnl bone. The extensor primi internodii 

 we have never seen in the Carnivora. The origin of the extensor 

 profundus is from the dorsal surface of the ulna, below that of the 

 extensor ossis metacarpi pollicis, as well as, sometimes, from the 

 dorsal surface of the radius. In the Felidse the muscle goes to the 

 pollex and index as a rule ; this is the case in Felis leo (1), F. tigris 

 (3), F.pardus (4), and F. catus (6). In Cyncalurus (9), however, no 

 slip goes to the index. Among the Viverridse the insertion is very 

 constant and is the same as it is in most of the Felidae : Crypto- 

 procta (10), Viverra civetta (12, 1.3), ViverricuJa malaccensis (15), 

 Genetta (16), Paradoxurus (19, 20), and Herpestes (24). In Pro- 

 teles (25) it is inserted into the third digit only. Among the 

 Hya3uidse there is no tendon for the aborted pollex; in Hycena striata 

 the muscle went to the third digit only in Meckel's specimen (27), 

 to the second and third in Cuvier and Laurillard's (28), and to the 

 second, third, and fourth in Young's (26). In H. crocuta it went to 

 the second only. The Canidse resemble the Hysenidae in the 

 feebleness of the slip to the pollex. Out of three specimens of 

 Cants familiaris it went to the first and second iu one (37) ; to the 

 second, with a very feeble slip to the pollex, in another (31) ; and to 

 the second digit only in a third (39). In C. aureus (41) Macalister 

 found an extensor secundi internodii, but no extensor indicis, 

 while in C. lagopus (42) a very feeble extensor indicis alone was 

 present. Among the Ursidae, Windle and Shepherd found no index 

 slip in Ursus americanus (48, 49), but in Cuvier and Laurillard's 

 specimen (52) it went to the pollex and index. In V. arctos (47) 

 and U. maritimus (45) it had the same insertion. Among the Pro- 

 cyonidfe the muscle is more constant ; it goes to the first and second 

 digits in Proajon lotor (53), P. cancrivorus (57), Nasua (60, 60 a) 

 (in the former (60) the two muscles were quite distinct as far as 

 their origin), and in Cercoleptes (61). In two other specimens of 

 F. Ivtor (54, 56) the insertion was into the pollex, index, and 

 ' Scchstcr Band, V. Abtheilung, 37-39 Lieferuiig, p. SJ6. 



