322 MESSES. B. C. A. WHSTDLB AND F. G. PARSONS OBT [Mar. 7, 



these muscles amongst the Edentates by saying that the splenius 

 colli is usually absent throughout the Order with the exception of 

 Bradypus, in which animal the splenius capitis is feeble or 

 wanting. 



Trapezius. — In Bradiipus (1, 2, 3, 5, 6) this muscle fails to reach 

 the occiput, a fact which seems to be correlated with the 

 lengthening of the neck due to the two extra cervical vertebrae. The 

 origin is from the ligamentum nuchse and the anterior 4th, 5th, and 

 (jtli spines. The anterior cervical fibres are continuous with the 

 clavicular deltoid to form a cephalo-humeralis ; the posterior cervical 

 and thoracic fibres are separated from the former by a fibrous 

 interval and are inserted into the spine of the scapula and acromion 

 process. In Gholcepus the anterior part rises from the occiput 

 and ligamentum nuchje, and is inserted into the lower border of 

 the scapular spine. The posterior fibres can with difficulty be 

 separated from these and are inserted into the whole length of the 

 spine. In the llyrmecophagidce the trapezius forms a continuous 

 sheet. In Myrmecophaga (13), Tamandua (14, 16), and two 

 specimens of Cydothurus (17, 21) there was no occipital origin, 

 but in other specimens of the last-named animal (18, 19, 20) the 

 muscle rose from the occipital curved line. In Cydothurus the 

 anterior fibres are inserted into the outer part of the clavicle, 

 which is well developed in this animal. In Myrmecophaga (11) 

 and Tamandua (14, 16) the anterior fibres form with the clavicular 

 deltoid a well-developed cephalo-humeral, and as usual there is a 

 fibrous intersection in the position of the clavicle. Amongst the 

 Dasypodidce, Dasypus (22) has the anterior fibres of the trapezius 

 arising from the deep surface of the anterior part of the carapace, 

 and these fibres form the cephalo-humeral. The posterior part of 

 the muscle rises from the fourth cervical to the last thoracic 

 spines and is inserted into the scapular spine. In Chlamydophorus 

 the anterior part of the muscle is separated from the posterior by 

 a cellular interval, the anterior fibres, as in Dasypus., arising from 

 the head-shield. In Tatusia no mention is made of an oingin 

 from the carapace. In the Manidce the cephalo-humeral is well 

 marked and rises from the occiput (29, 31, 32, 33, 34). The 

 remainder of the muscle forms one mass and is inserted into the 

 spine of the scapula and its acromion process. In Orycteropus 

 (35, 36, 37) the origin is from the occiput, ligamentum nuchise, and 

 anterior nine or ten thoracic spines, the insertion is into the spine 

 and acromion process of the scapula, but there is apparently no 

 clavicular bundle or cephalo-humeral muscle. 



Latissimus dorsi. — This muscle has the ordinary origin from the 

 posterior half of the thoracic spines, the lumbar fascia, and three 

 or four posterior ribs, and is inserted, as usual in mammals, into 

 the humerus below its neck. In the Dasyp>odidce it is remarkable 

 for rising from more ribs than usual, often from the third or 

 fourth to the last. These costal origins blend with the deep part 

 of the insertion of the pectorals, and form a muscular floor to the 

 axilla. We regard them as unusually well-developed achselbogen, 



