344 TRANSACTIONS OF THE [oCT. 4, 



The same authors also find the muscle well developed in 

 Cheiromys, correspondino; to the arrangement in L. catta. 



Van Campen (3, p. 28, PI. II., fig. 10, 3) states that the 

 muscle is small in the Potto. 



Burraeister (6, p. 51, tab. 4, fig. 2, 19) describes the inser- 

 tion in Tarsius as occupying the whole inferior surface of the 

 clavicle. 



Lucffi in his account of L. macaco does not mention the mus- 

 cle, but, as his descriptions are in the main superficial and in- 

 complete, there is no reason for supposing that the muscle is 

 absent in the species in question. 



Allen also does not describe the muscle in his account of 

 Tarsius fuscus. 



The constant occurrence and nearl}' uniform arrangement of 

 the Subclavius throughout the Lemuroidea again emphasizes 

 the close assimilation of the thoraco-appendicular muscular 

 group to the type presented by the higher Primates. 



3. Serratus Anterior 

 (PI. XXVIII. and XXXIV.) 



This muscle is continuous cephalad with the Levator scapulae, 

 which arises from the transverse processes of all the cervical ver- 

 tebrae. The Serratus arises by digitations from the 1st to the 

 8th rib inclusive. The origin from the first rib is continuous 

 with the caudal portion of the Levator scapulae, and takes place 

 under cover of the lateral thocacic prolongation of the Scalenus, 

 The second digitation is broad ; it and the third are likewise 

 under cover of the medial portion of the Scalenus at their origin. 



The fourth digitation is covered by the mesal part, and in 

 turn, in proceeding laterad, overlaps the lateral portion of the 

 thoracic Scalenus at the insertion of the latter muscle into the 

 fourth rib. 



The fifth digitation fits into the interval between the first and 

 second digitation of the External Oblique and the lateral mar- 

 gin of the Scalenus. The origins from the f)th, Ith and 8th ribs 

 interdigitate with the slips of the External Oblique. The inser- 

 tion occupies the entire ventral border of the vertebral margin 

 of the Scapula, caudad of the insertion of the Levator scapul!\>, 

 and ventrad to the scapular attachment of the Rhomboideus. 



The close connection between the Serratus anterior and the 

 Levator scapulae appears to be a widely distributed myologicai 

 character throughout the Lemuroidea. 



Murie and Mivart (1, p. 57) describe the Levator as the 

 cervical portion of the Serratus in L. ca^^a, mentioning an origin 



