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Show 400 DR. B. 0. A. WINDLE AND MR. F. G. PARSONS ON THE [Apr. 6, it as being very large, and says that it is inserted into the platelike process of the radius. In Proteles (25) it resembles the same muscle in the Hyaenidae and is attached to the whole length of the bones. Among the Hyaenidae it occupies the whole length of the forearm in Hycena striata (26, 27) and H. crocuta (29). In the Canidae all writers agree in saying that the pronator quadratus of the dog occupies the whole length of the forearm, and we have verified the statement (31). The same arrangement is found in Canis aureus (41), C. vulpes (42, XXIII.), C. lupus (XXIII.), and Lycaon pictus (44). Among the Ursidae the muscle only occupies the lower third of the forearm in Ursus arctos (47) and U. americanus (48, 49, 50, 51). In the Procyonidae it was found in the lower two-thirds in Procyon lotor (53) and P. cancrivorus (57), but Allen (XXVI.) describes it asoccupv-ing half the forearm in the former animal (54). In Nasua (58, 60 a) and Cercoleptes (61) it was only present in the lower third, though Perrin (XXIX.) describes it as taking up the lower two-thirds in the latter. Among the Mustelidae the muscle occupies the whole forearm in Mustela putorius (65); the lower half in Galictis vittata (63), Lutra cinerea (78), and L. vulgaris (7'4); the lower third in Meles (71) and Ictonyx (70). From the foregoing it will be seen that in the Felidae the pronator quadratus is attached to the lower half of the ulna and radius, in the Canidae and Hyaenidae to the whole length, in the Ursidae to the low'er third, while in the Viverridae, Procyonidae, and Mustelidae it is variable. Supinator longus.-This muscle rises from the external supracondylar ridge of the humerus for a variable extent, in some cases reaching as high up as the surgical neck ; it is inserted into the radial side of the lower end of the radius. Among the Felidae it is present in Felis leo (1), F. tigris (3), F. pardus (4, XXXIX.), F. catus (domestic) (6, 7, 7 a), F. catus (wild) (XXXIX.), but in Cyncelurus (9) it was not found. In the Viverridae it was found in Cryptoprocta (10), Viverra civetta (12, 13), V. malaccensis (15), Genetta tigrina (16), where it sends an expansion to the dorsal carpal ligaments, G. tigrina (17), Paradoxurus typus (19, 20), Herpestes nepalensis (23), and H. griseus (24). In Hemlgalea (XI.) is also present and is attached to the plate-like process of the radius. In Proteles (25) it is absent. Among the Hyaenidae it is absent in H. striata (26,27, 28), and is a mere vestige in H. crocuta (29). With regard to the Canidae we have had some little difficulty in following the accounts of other writers. The muscle is certainly absent in the following four dogs: 31, 34, 36, 38. In one specimen (37) it was absent on the left, rudimentary on the right. In another specimen (35) it only weighed 1*07 grs., and must therefore have been very feebly marked. In a dog described by Haughton (32) the muscle is said to be present, but he states that there is only one extensor carpi radialis, which is inserted into the little and ring fingers; in this case we cannot help suspecting that the muscle described by him as supinator longus was really the other extensor carpi radialis. In Lycaon |