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Show 1899.] THE MYOLOGY OF THE EDENTATA. 333 the annularis and minimus were supplied by slips from the olecranon and the surface of the flexor profundus. W e are, however, not sure whether some of these factors should not rather be referred to the palmaris longus. In 30 the flexor sublimis passed from the condyle to the medius only; before being perforated by the profundus in the theca it had the usual ring passing deep to that tendon. In (29) and (31) no flexor sublimis was seen. Of the other specimens, (34) had also a slip for each digit, Avhilst (33) resembled (29) and (31) in having no sublimis at all. In Oryeteropus (35, 36, 37) there were in each case four tendons for the four digits. Flexor carpi ulnaris.-As usual, this muscle rises from the internal condyle, olecranon, and margin of the ulna. The condylar and olecranal heads unite in the forearm to be inserted into the pisiform. In Bradypus (1, 3, 5) the tendon, instead of ending iu the pisiform, was inserted into the base of the most ulnar of the three metacarpals. In Cyclothurus (13) the muscle is very large aud important in function ; the pisiform, a fact no doubt correlated with that just mentioned, is also very large. Flexor profundus digitorum.-In the Bradypodidce, Bradypus (1, 2, 3, 5) has radial, ulnar, and condylo-ulnar heads and divides into three tendons for the three digits. In our own specimen of Cholcepus (8), radial, uluar, condylo-central, and condylo-ulnar heads were present, and this seems also to have been the condition in 9 and 10. The muscle ends in tAvo strong tendons. In the Myrmecophagidce, Myrmecophaga has a head continuous with the lower part of the triceps and already described in connection with that muscle. In addition to this it possesses radial, ulnar, and condylar heads. It is a very large muscle and has a variable insertion. In Pouchet's specimen (12) a slip \ATas given to the pollex, but in that at the B.C.S. there were only three tendons, neither pollex nor minimus receiAing one. Iu one specimen of Tamandua (15) a humeral head Avas present, but Ave failed to find it in our specimen (14). In this instance, however, the factors were much united, and we with difficulty identified radial, ulnar, condvlo-ulnar, and condylo-central portions. In one specimen (15) the tendons passed to all five digits, whilst in the other (14) the pollex was not supplied with one. In Cyclothurus (17, 18, 19, 20, 21) we have no records as to which condylar heads are present, but the muscle only possesses tAvo tendons, which pass to the second and third digits respectively. In Dasypus (22, 23, 24), Tatusia (25, 26), and Chlamydophorus (27) the muscle is very large, the ulnar portion being specially Avell developed. In all these animals a strong fibro-cartilaginous sesamoid is developed in the palmar part of the tendon before its division, beyond Avhich slips are given off to all the five digits. In two specimens of Manis (30, 32) there Avere condylo-ulnar, radial, and ulnar heads present. In another (29) the condylo-centralis Avas present in addition. A palmar sesamoid is present as in the Armadillos, but not to such a marked extent. There may or may not be a small |
