340 TRANSACTIONS OF THE [oCT. 4, 



Owen (8, p. 60, PI. XXII. find XXIII., figs. 1, 17) describes 

 only two portions in Gheironiys ; the same arrangement was 

 found in this animal by Marie j?nd Mivart, but in this specimen 

 the clavicular portion arose by a tendon from the sternal end of 

 the clavicle. 



Lucse (12, p. 27) in his monograph on Lemur macaco gives 

 a brief description and a delineation of the Pectoral group. He 

 states nothing regarding a separation of Ento- and Ectopectoral. 

 He describes the Pectoralis (Ectopectoral? P. major?) as 

 having two divisions ; the anterior (cephalic) smaller divi- 

 sion arises from the sternal end of the clavicle, cartilage of 

 first rib and manubrium of sternum, and descends, connected 

 with the Deltoid, over the upper third of the humerus. The 

 posterior (caudal) larger division is described as arising 

 from the entire length of the sternum and the cartilages of the 

 anterior (cephalic) ribs, and as being inserted underneath the 

 preceding portion, into the head of the humerus and the Cora- 

 coid process (I) This is the only instance mentioned \ in the 

 descriptions of the various genera in which the Pectoral fibres 

 are said to have obtained an attachment to the coracoid process. 

 Further reports on the arrangement of the Pectoral group in 

 L. macaco are desirable, as Lucse's account is neither full nor 

 explicit. 



Allen (13, p. 42) describes the Ectopectoral of Tarsius 

 fuscus as " small and composed of two fascicles. The sheet is 

 not folded. The superficial fascicle consists of an upper and 

 lower congeries of fibres, which are distinguished by their trend 

 rather than by relation. The fibres of insertion are continuous 

 inferiorly with the Deltoideus.'" He does not mention the En- 

 topectoral. 



The Entopectoral of Lemur catta is described by Murie and 

 Mivart (1, p. 27) as a strong, thick muscle arising from the 

 sternum beneath the Ectopectoral, the origin extending from 

 the second to the sixth rib inclusive. The insertion is into the 

 capsular ligament of the humerus. 



The extent of the origin (second to sixth rib inclusive) agrees 

 with the arrangement of the muscle in L. bruneus, but in the 

 latter species the main points of origin are from the costal car- 

 lilages, only a few fibres arising from the lateral margin of the 

 sternum in the corresponding intercostal spaces. 



Cuvier (11, PI. LXVIII., fig. 1,,/^) figures the muscle in L. va- 

 rius. Murie and Mivart (1, p. 27) find it of large size in Galago 

 crassicaudatus, and state that the arrangement of the muscle is 

 the same as in L. catta. The^^ failed to detect any trace of an 

 Entopectoral muscle in Galago allenii. 



