326 MESsas. b. o, a. windle and e. g. parsons on [Mar. 7, 



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

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

 shoulder ; while the abdominal pectoral (pectoralis quartns) was 

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

 panniculus. Cuvier and Laurillard (6) show in their iigure an 

 absence of pectoralis quartns, thus agreeing with Macalister and 

 Mackintosh, but they represent a fairly well-marked pectoralis 

 minor. 



In C'holoepus 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 Myrmecophaga (13) the super- 

 ficial and deep manubrial fibres were fused and the superficial and 

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

 Tamandua (14) and Cyclotliwus (17, 18) the superficial manubrial 

 and gladiolar fibres w^ere 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 latissimus 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 ChlamydopJionis (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 Orycteropus, Macalister (I,), 

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

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



Suhdav'ms. — This muscle in the Edentates varies a good deal and 

 is of considerable interest. In the Brady p>odidce 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 Cliolospus (10 and a specimen of 

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

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

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

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

 the muscle is always large and inserted chiefly into the acromion 

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

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

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

 Orycteropodldoe 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 usu.al 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 lowest and pass 



