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Show 324 MESSRS. B. C. A. WINDLE AND F. G. PAESONS ON [Mar. 7, origin from the teres major. In Chlamydophorus (27) it is also large and is inserted into the internal condyle, internal lateral ligament, olecranon, and fascia of the forearm. In the Manidce the muscle is not quite so Avell developed as in the Armadillos ; in this class it is inserted into the olecranon and fascia of the forearm (29, 30, 31, 32, 33). In Oryeteropus (35) the muscle rises from the latissimus dorsi and apparently gets additional slips from the scapula and teres major; in part it joins the long head of the triceps. Rhomhoidei.-We have found it convenient for the purposes of mammalian myology to describe the rhomboid sheet in two parts, viz. rhomboideus capitis et colli and rhomboideus thoracis. In the Bradypodidce the rule holds good Avhich we have already found to apply to other neck-muscles. In correlation with its additional cervical vertebras, Bradypus (1, 3, 4, 5) has no occipital origin to the rhomboid, whilst in Cholcepus this origin is Avell marked. In Bradypus there is no division between the rhomboidei colli et thoracis, but in Cholcepus (8) the r. thoracis, winch is inserted into the vertebral border of the scapula opposite the root of the spine, is, at its origin, deep to the rhomboideus capitis et colli. In the Myrmecophagidce the muscle forms a single undivided sheet without any occipital origin in Myrmecophaga (13), Tamandua (14, 16), or Cyclothurus (18, 19, 20). In the Dasypodidce an occipital origin is ahA'ays present and the rhomboideus thoracis is usually separate from the rhomboideus capitis et colli. The rhomboideus capitis often forms a separate slip and is called by Galton (VI.) the occipito-scapular. In the Manidce the occipital origin is also always present (29, 31, 33, 34). In the Orycteropidce the occipital origin is present but ill-developed (35, 36). Rhomboideus profundus (Levator scapulce minor).-This muscle, which rises from the transverse process of the atlas and is inserted into the base of the spine of the scapula, seems only to be distinct in Oryeteropus (35, 36, 37). Indications of it may be found iu other animals, but in them it is usually more or less blended with adjacent muscles, such as the rhomboideus capitis et colli, omo-trachelian, or serratus ventralis colli (neck portion of serratus magnus). Serratus ventralis colli et thoracis (Serratus maqnus).-The folloAving origins of this muscle are given by different observers :- Cerv. Tr. Procs. Eibs. Bradypus (1) absent. 1-7 „ (2) 6-9 1-2 (3) 6-9 1-8 „ (4) 9 1-7 „ (5) 7-9 1-7 „ (6) 9 1-7 Cholcepus (10) 5-7 1-8 Myrmecophaga (13) 2-7 1-8 Tamandua (14) 1-7 1-7 |
