94 The Alligator and Its Allies 
inserted on the ventral surface of the coracoid at 
the boundary of the scapula. 
Costo-scapularis (Collo-scapularis superficialis, 
Levator scapula superficialis). See shoulder 
muscles. 
Costo-vertebralis Medialis (Scaleni). Fairly large, 
flat, and long-drawn-out three-cornered muscle. 
Attached by its base to the most anterior sternal 
rib, by its upper border to the fifth cervical rib, 
and by its point to the end of the second cervical 
rib. 
Costo-vertebralis Lateralis (Longus colli). Origi- 
nates thin and sharp on the body of the fifth 
thoracic vertebra, increases in thickness slowly 
but decidedly cephalad, then again becomes thinner 
and inserts itself on the inner side of the ribs of the 
most anterior two cervical vertebre. 
Collo-capitis (Rectus capitis anterior). Arises, 
as a rule, from the cervical centra, at times from 
the second thoracic vertebra (Gavialis). It ex- 
tends forward and is inserted on the basi-occipital 
and the hinder border of the pterygoid. For a 
’ greater part of their length the two muscles lie 
close together, but forward they separate somewhat 
from each other. 
DorsaL NECK MUSCLES 
Occipito-cervicalis \fedialis (Complexus cervicis, 
Biventer cervicis, Zweibauchiger Strecker or Zwei- 
