326 MESSES. B. C. A. AV^INDLE AND F. G. PAESOXS OX [Mar. 7, 



In our specimens (1, 7) we found a feeble pectoralis minor rising 

 from the second costal cartilage and passing to the fascia over the 

 shoulder ; while the abdominal pectoral (pectoralis quartus) was 

 present and closely blended with the abdoinino-humeral part of the 

 paimiculus. Cuvier and Laurillard (6) show in their figure an 

 absence of pectoralis quartus, thus agreeing with Macalister and 

 Macldntosh, but they represent a fairly well-marked pectoralis 

 minor. 



In C'holcepus a special bundle corresponding in origin to the 

 superficial gladiolar fibres was inserted into the inner border of the 

 flexor surface of the forearm. In MyrmecoijJiaga (13) the super- 

 ficial and deep m-.mubrial fibres were fused and the superficial and 

 deep gladiolar were distinct. There was no pectoralis minor. In 

 Tamandna (14) and C_i/cJoihurii.s (17, IS) the superficial manubrial 

 and gladiolar fibres were fused. In Dasypus (22, 24) the same 

 condition obtains, but the place of the deep gladiolar fibres is taken 

 by the large part of the Litissimus dorsi which passes across the 

 floor of the axilla and is inserted with the pectorals. In Tatusia 

 (25) clavicular, sternal, and abdominal bundles are present, and the 

 same description applies to CMamydophorus (27). In Manis (29, 

 30, 32) the superficial manubrial bundle is well marked, and, 

 although narrow at its origin, spreads out to be inserted from the 

 lower end of the deltoid tubercle to the internal condyle. In one 

 specimen (30) it is noted that these manubrial fibres are twisted 

 upon themselves in such a way that those rising most deeply were 

 most superficial at their insertion. In Orycta-ojms, Macalister (I.), 

 Humphry (IX.), and Gralton (Till.) all agree that a pectoralis minor 

 is present. The pectoralis quartus (37) is also well marked. 



Suhdavius. — This muscle in the Edentates \'aries a good deal and 

 is of considerable interest. In the Bradypodidce it is present and 

 is inserted not only into the clavicle, but into the coracoid process 

 and acromion. This was the case in six specimens of this animal 

 (2, 3, 4, 5, 6, 7) and in two of Clieltepus (10 and a specimen of 

 Galton's). In the Mynnecoplutijldce the muscle is absent not only 

 in Myrmccopliaga (13) and Tamandua (14 and X. p. 528), which 

 have only rudimentary clavicles, but also in Cyclothums (17, 18, 

 20, 21), in which this bone is well developed. In the Dasypodidce 

 the muscle is alwaj's large and inserted chiefly into the acromion 

 process and the fascia over the supraspinatus. This is true of 

 Dasypus (22, 23), Tatusia (25), and Chlamydophorns (27, 28). 

 In the Manidfe the muscle is wanting (29, 31, 32, 33, 34). In the 

 Orycteropodidce the subclavius is present (35, 36), but, as in most 

 Edentates, is inserted more into the acromion and fascia over the 

 supraspinatus than into the clavicle. This arrangement is clearly 

 an approach to the sterno-scapularis muscle so constantly found 

 amongst hystricomorphine rodents. 



Deltoid. — The usual three parts of the deltoid are present in 

 Edentates, and, as a rule, are inserted very close together into the 

 deltoid ridge. Speaking generally, the usual mammalian rule is 

 borne out, that clavicular fibres are inserted Iciest and pass 



