100 The Alligator and Its Allies 
size on the ventral side of the breast; it consists of 
a lateral and of a medial portion, the former 
springing from the last cervical rib, the latter from 
the anterior border of the first sternocostal ridge. 
The two parts unite and are inserted on the whole 
posterior border of the coracoid. 
Pectoralis minor (Pectoralis, Costo-coracoideus). 
A broad, considerable muscle on the under side 
of the breast, which is made up of two parts, of 
which the lateral springs from the anterior border 
of the last (ninth) cervical rib, and the medial from 
the anterior border of the first sternocostal ridge. 
Both parts unite into a homogeneous layer which is 
inserted broadly on the whole hinder border of the 
coracoid. 
Pectoralis (Plate I., Figs. 1 and 2, p) (Pec- 
toralis major, Grosser Brustmuskel). A broad 
muscle on the under side of the breast, bounded 
behind by the rectus abdominis and obliquus 
abdominis externus muscles, with which it is 
united. It arises from the whole episternum, 
from the whole sternum, except from the median 
line of its posterior part, from the sternal ends of 
the first six thoracic ribs, from all six sternocostal 
ridges, and, with a small prong, from the eighth 
rib. It is inserted on the distal part of the convex 
surface of the processus lateralis humeri. 
Supracoracoideus (Plate I., Figs. 1 and 2, spc) 
(Supracoracoscapularis, Deltoideus, Schliussel- 
beinhalfte, Theil der Schulterblatthalfte des Hebers 
