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, i 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. 



Snpracoracoideus (Plate I., Figs, i and 2, spc) 

 (Supracoracoscapularis, Dcltoideus, Schliissel- 

 beinhalfte, Theil der Schulterblatthalfte des Hebers 



