■^^'^'^O THE MVOLOGr OF THE EDEXTATA. 1009 



iliacus. In Maais (29, 31, 32) the muscle arose tVoin the trans- 

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

 described as present in Orrjcteropus (3b, 36). 



I'soasparvus.—This muscle is generally present, and when present 

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

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

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

 (10) It IS described as present. 



Amongst the Myrmecojihar/ldce it is noted as having been 

 present in J/^/-mfco^j7;.«,/a (12), Tamandua (14), and Cydothurx,s 

 (1/), and in the second of these it arose from the last dorsal and 

 hrst two lumbar vertebrae. Amongst the Dasypodidcp it arose in 

 Dai^iipus (22, 23) from the last dorsal and first two lumbar vertebra- 

 It was present, though small, in Tatasia (25), and is also noted as 

 present in CMamydophorus {21, 28 a). In the former of these it is 

 described as a strong muscle. Jn Manis it is ahvays present and 

 strong, generally arising from five lumbar vertebrce (31, 32, 33, 34) 

 In Orijcteropus (36) it arose from the bodies of the lumbar vertebrae 

 and also slightly from the last rib, and its presence is also noted 

 in (35). 



Iliacus.— Afi 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 Cydotliurus (17), Chlamn- 

 dophorus [28 a), the proximal third of the "femur, Manis (32), more 

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

 another animal of the same species tigureJ by Cavier and Lauril- 

 lard (3/) the iliacus was divided into two bundles, an external and 

 an internal. 



Myological Characteristics of the various Families of Edentata. 

 ERAnrpoDiDvi. 



1. The dorsal part of the panuiculus is feebly marked, and there 



is no sterno-facialis or sphincter colli. 



2. The sterno^maxillaris is absent. 



3. The sterno-glossus is absent. 



4. The rectus thoracis lateralis is present. 



5. The splenius colli is present in Bradi/pus. 



6. The rhomboid has no occipital origin in Bradi/pus, though 

 there is one in Cholcepus. " 



7. The subclavius is large. 



8. The clavicular deltoid forms a cephalo-humeralis in B-adinms 



not in Choloepus. ' 



9. Bradijpus has the middle part only of the coraco-brachialis 



Cholwpus the short and long portions. ' 



10. Bradiipns has humeral and glenoid heads to the flexor lono-us 



cubiti (biceps), Cholcep)us the glenoid head only. ' ° 



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



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



