1897.] NEW YORK ACADEMY OF SCIENCES. 341 



Van (ler Kolk and Vrolick (4, p. 44) state that the muscle 

 is present in Loris^ its fibres intermingling with those of the 

 Ectopeetoral. In this species the muscle is said to be inserted 

 into " the internal (?) tubercle of the humerus, previously pass- 

 ing before the coracoid process." 



Cuvier (H, PI. LXVIL, fig. 2, J'^) represents it as very small 

 in Lor is gracilis. 



Murie and Mivart (1, p. 27) find it distinct in Nycticebus 

 tardigradus. 



Van Campen (3, p. 27, PI. II., fig. 10, 2) describes the muscle 

 as broad in Perodicticvs, inserted into the greater tuberosity of 

 the humerus. 



Burmeister (6, p. 51, tab. 4, figs. 2,18) describes the muscle 

 as well developed in Tarsius, " arising from the second to the 

 seventh rib, inserted into the sharp outer edge of the bicipital 

 groove and ridge," close to the Ectopeetoral. 



Owen (8, p. 60) describes the muscle in Gheiromys as aris- 

 ing from the side of the presternum, and from the sternal 

 ends of the first to the fifth ribs. The insertion is by a strong 

 tendon which spreads over the head of the humerus, to be at- 

 tached to tlie great tuberosity. 



Murie and Mivart ( , p. 27) in their specimen of Cheiromys 

 found the muscle arising from the cartilages of the 4th, 5th, 6th 

 and 7th ribs. 



In comparing the observations cited with the results of the 

 dissection of the Pectoral muscles in Lemur bruneus the follow- 

 ing considerations suggest themselves : 



1. The connection of the Pectoral insertion with the tendon 

 of an axillary arch from Latissimus dorsi has not before been 

 observed in any of the Lemuroidea. The arrangement of the 

 arch in our species is in accord with the conditions presented by 

 the majority of the lower monkeys, especially the Cynomorpha. 

 The only point of difierence to be noted is the complete union of 

 the tendon of the arch with the Pectoral tendon. In the Cyno- 

 morpha the tendon usually expands more into the deep brachial 

 fascia over the Coraco-brachialis and short head of the Biceps. 

 This corresponds to the condition usuall}^ found in man, although 

 the arrangement presented by the little muscular slip in Lemur 

 bruneus. i. e., union with the deep surface of the Pectoralis ten- 

 don, constitutes a distinct variet\' of the human axillar}^ arch. 



The muscular slips described and figured by Murie and Mivart 

 (1, PI III., fig. 5, Pc.) in the Grand Galago, and by Lucffi (12, 

 p. 26, tab. 2, 22) in Lemur macaco, as humeral portions of the 

 paniculus carnosus are undoubtedly homologous with the ax- 

 illar\- slip from the Latissimus dorsi which our species presented. 



