324 MESSRS. B. C. A. WINDLE AND F. G. PARSONS ON [Mar. 7, 



origin from the teres major. In Chlamydojohorus (27) it is also 

 iarge 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 well 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 Orycteropus (35) the muscle rises from 

 the latissimu.s dorsi and apparently gets additional slips from the 

 scapula and teres major ; in part it joins the long head of the 

 tricpps. 



EJiomboidei. — 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 which we have already found 

 to apply to other neck-muscles. In correlation with its additional 

 cervical vertebrae, Brudypus (1, 3, 4, 5) has no occipital origin to 

 the rhomboid, whilst in Cholcepus this origin is well marked. In 

 Bradypus there is no division between the rhomboidei colli et 

 thoracis, but in Oholcepus (8) the r. thoracis, which 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 MyrmecophagidcB the muscle forms a single undivided sheet 

 without any occipital origin in Myrmecopliaga (13), Tamandva (14, 

 16), or Cyclothurus (18, 19, 20). In the Dasypodidce an occipital 

 origin is always 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 Orycteropus (35, 36, 37). Indications of it may be found in 

 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 tlioracis (^Serratus magnus). — The 

 following 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 



Myrmecopliaga (13) 2-7 1-8 



Tamandua (14) 1-7 1-7 



