1899.] THE MrOLOST OF THE EDEXTATA. 1009 



iliacus. In Manis (29, 31, 32) the muscle arose from the trans- 

 verse processes of the three lower lumbar vertebrse. It is also 

 described as present in Orycteropus {3o, 36). 



Faoas parvus. — This muscle is generally present, and when present 

 always inserted into the ilio-pectineal tubercle as usual. In 

 Brady pux (1,2, 4, 7) it seems always to be a feeble muscle, and 

 usually to come only from the first lumbar vertebra. In Cholapus 

 (10) it is described as present. 



Amongst the Myrmecophagidce it is noted as having been 

 present in M yrmecoplraga (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 

 Daaypus (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 Chlamydopliorus (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 Orycteropus (36) it arose from the bodies of the lumbar vertebrae 

 and also slightly from the last rib, and its pi-esence is also noted 

 in (3.5). 



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 Cyclothurus (17), Chlamy- 

 dophorus (28 «), the proximal third of the femur, Manis (32), more 

 than half the femur, Orycteropus (35, 36), half the femur. In 

 another animal of the same species figured by Cuvier and Lauril- 

 lard (37) the iliacus was divided into two bundles, an external and 

 an internal. 



Myologieal Characteristics of the various Families of Edentata. 



Bradypodid^. 



1. The dorsal part of the panniculus is feebly mai-ked, and there 



is no sterno-facialis or sphincter colli. 



2. The sterno-maxiilaris is absent. 



3. The sterno-glossus is absent. 



4. The rectus thoracis lateralis is present. 



5. The splenius colli is present in Bradypus. 



6. The rhomboid has no occipital origin in Bradypus, though 



there is one in Choloepus. 



7. The subclavius is large. 



8. The clavicular deltoid forms a cephalo-humeralis in Bradypus, 



not in Choloepus. 



9. Bradypus has the middle part only of the coraco-braehialis, 



Chokepus the short and long portions. 



10. Bradypus has humeral and glenoid heads to the flexor longus 



cubiti (biceps), Choloepus the glenoid head only. 



11. The extensor cubiti (triceps) has only one scapular head. 



12. The flexor carpi radialis does not reach the metacarpus. 



