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Show 1899.] *niE MYOLOGY OF THE EDENTATA. 1009 iliacus. In Manis (29, 31, 32) the muscle arose from the transverse processes of the three lower lumbar vertebrae. It is also described as present in Oryeteropus (35, 36). Psoas parvus.-This muscle is generally present, and when present always inserted into the ilio-pectineal tubercle as usual. In Bradypus (1, 2, 4, 7) it seems always to be a feeble muscle, and usually to come only from the first lumbar vertebra. In Cholcepus (10) it is described as present. Amongst the Myrmecophagidce it is noted as having been present in Myrmecopjhaga (12), Tamandua (14), and Cyclothurus (17), and in the second of these it arose from the last dorsal and first two lumbar vertebra*. Amongst the Dasypodidce it arose in Dasypus (22, 23) from the last dorsal and first two lumbar vertebrae; it was present, though small, in Tatusia (25), and is also noted as present in Chlamydophorus (27, 28 a). In the former of these it is described as a strong muscle. In Manis it is always present and strong, generally arising from five lumbar vertebrae (31, 32, 33, 34). In Oryeteropus (36) it arose from the bodies of the lumbar vertebras and also slightly from the last rib, and its presence is also noted in (35). Iliacus.-As has been mentioned above, this muscle is often more or less fused with the psoas magnus. It also not infrequently obtains a much larger insertion into the femur than is the case in human myology. This is the case in Cgclothurus (17), Chlamy-dophorus (28 a), the proximal third of the femur, Manis (32), more than half the femur, Oryeteropus (35, 36), half the femur. In another animal of the same species figured by Cuvier and Laurillard (37) the iliacus was divided into two bundles, an external and an internal. Myological Characteristics of the various Families of Edentata. BRADYPODIDcE. 1. The dorsal part of the panniculus is feebly marked, and there is no sterno-facialis or sphincter colli. 2. The sterno-maxillaris is absent. 3. The sterno-glossus is absent. 4. The rectus thoracis lateralis is present. 5. The spleuius colli is present in Bradgpus. 6. The rhomboid has no occipital origin iu Bradypus, though there is one in Cholcepus. 7. The subclavius is large. 8. The clavicular deltoid forms a cephalo-humeralis in Bradgpus, not in Cholcepus. 9. Bradypus has the middle part only of the coraco-brachialis, Cholcepus the short and long portions. 10. Bradgpus has humeral and glenoid heads to the flexor longus cubiti (biceps), Cholcepus the glenoid head only. 11. The extensor cubiti (triceps) has only one scapular head. 12. The flexor carpi radialis does not reach the metacarpus. |
