1897.] NEW YORK ACADEMY OF SCIENCES. 345 



from the first eight ribs for the latter muscle, and an insertion 

 into the entire vertebral border of the Scapula, " posterior to 

 the insertion of the Levator portion." 



Cuvier (11, PI. LXIX., fig. 2, and PL LXXI., figs. 1, 2, .3, 9) 

 indicates the two muscles b}^ one letter in L. catta and L. varius. 



Murie and Mivart (I, p. 57) state that in L. vaiHus the Ser- 

 ratus anterior (magnus) appears to have attachments to the en- 

 tire series of Cervical vertebrte, evident!}' referring to the conti- 

 nuit\' of the muscle with the Levator scapulte. 



The same authors (p. 57) state that in L. xanthomystax the 

 Serratus is " in union with the second slip of the Scalenus," 

 possibly referring to the interdigitation of the fourth slip of 

 the Serratus with the thoracic prolongation of the Scalenus, as 

 described above in L. hruneus. 



The authors quoted find that in Oalago crassicaudatus Cp. 57, 

 PI. II., fig. 3 ; PI. III., figs. 5 and 6 ; Pl.'lY., figs. 13 and 14 ; PI. 

 Y.,fig. 16, Smg.) the combined Serratus and Levator arises from 

 all the transverse processes of the Cervical vertebrae and from 

 the first eight ribs, and that the muscle is inserted into the 

 vertebral border of the Scapula. In Gallago allenii ( I , p. 57) 

 the muscle arises from the first seven ribs; m'Nycticebus from 

 the first ten ribs. 



Van Campen (3, p. 28) finds that the muscle in Perodicti- 

 cus arises from eleven ribs, and Burmeister (6, P- 48, tab. 3, 

 figs. 1-8) describes the same in Tarsius as arising by eight 

 digitations from the 2d to the 9th rib. Allen (13, p. 43) 

 mentions, but does not describe, the Serratus in Tarsius fucsus ; 

 he finds that in this species the Levator scapulae " arises from 

 the transverse processes of the fifth to the seventh cervical ver- 

 tebrae, and is inserted on the superior angle of the Scapula." 



Murie and Mivart (I, p. 57) find that the muscle in Gheir- 

 omys corresponds to the arrangement presented by Lemur catta. 

 Lucoe (12. pp. 29 and 30), who describes both muscles under 

 the name of " Serratus anticus major," states that in Lemur 

 macaco the origin occupies the transverse processes of the sec- 

 ond to the seventh cervical vertebra and the lateral surfaces of 

 the seven anterior ribs. The insertion is on the" inner surface of 

 the Scapula," beneath the Rhomboideus. 



The significance of the above detailed arrangement of the Ser- 

 ratus anterior will be considered in connection with that of the 

 remaining deep muscles on the ventral and lateral aspects of the 

 thorax. Taken together the group in question presents a strik- 

 ing carnivore aflfinitv. 



