ANATOMY OF THE LEMUROIDEA. 57 
of the spine of the scapula. Unlike that in Lemur the muscle inferiorly is entirely 
overlapped and hidden by the trapezius (PI. III. fig. 8, Lc). 
LEVATOR ANGULI SCAPULE.—This is so closely united at its posterior (lower) end with 
the serratus magnus, that it may be regarded as the cervical portion of the latter 
muscle’. It arises from the root of the transverse process of the atlas, and from the 
transverse processes of all the other cervical vertebrz, and is inserted into the border 
of the scapula from midway between the insertions of the omohyoid and rhomboideus 
capitis to the insertion of the latter, into the delicate tendons of which some of its 
fibres are inserted. It is not covered by the rhomboideus, its insertion being anterior 
to the insertion of that muscle. 
Meckel says, ‘dans les Loris et les Makis proprement dits il se rend seulement a 
Vatlas” (loc. cit. p. 236); but then he attributes an extensive cervical origin to the 
serratus magnus (J. ¢. p. 248). 
What may either represent a large levator anguli scapule or a continuation into the 
neck of the serratus magnus, is figured in Galago crassicaudatus (Pls. III. & IV. figs. 6 
& 9, L.a.s=S.mg). 
In the Potto? it arises from the transverse processes of the five most anterior cervical 
vertebree. 
In Tarsius* to the transverse processes of the six hindermost cervical vertebre. 
c. Dorsal Region (deep layer). 
SERRATUS MAGNUS.—Arising from the first eight ribs by as many digitations, that 
from the first rib being the broadest, it is inserted into the whole vertebral margin of 
the scapula posterior to the insertion of the levator anguli scapule. It is nearly 
coequal in extent with the rhomboideus. This muscle is closely connected with the 
long insertion of the scalenus at the third rib; and its three hindermost (lowest) serra- 
tions interdigitate with those of the external oblique. 
In L. varius it appears to have attachments to the whole of the cervical vertebre. 
In L. xanthomystasx it is in union with the second slip of the scalenus. 
In Galago crassicaudatus (Pl. II. fig. 3, Pl. III. figs. 5 & 6, Pl. IV. figs. 13 & 14, and 
Pl. V. fig. 16, S.mg) the combined serratus magnus and levator anguli scapule arise 
from all the transverse processes of the cervical vertebre and the first eight ribs. 
Insertion the vertebral margin of the scapula. In G. allenii to the seventh rib. 
In Nycticebus it arises from the first ten ribs. 
In Perodicticus, according to Van Campen ‘, this muscle arises from eleven ribs. 
In Tarsius* it springs by eight digitations from the second to the ninth rib. 
We have found it in Cheiromys quite as in L. catta. 
1 The two muscles spoken of are indicated by one letter by Cuvier in Z. catta and L. varius, pl. 69. fig. 2 
and pl. 71. figs. 1, 2, 3, g. 2 Loc. cit. p. 31. 
3 Loc. cit. p. 47, tab. 4. fig. 1. 5. 4 Loe. cit. p. 28. 5 Loe. cit. p. 48, tab. 3. fig. 1. 8. 
VOL. VII.—PART I. I 
