66 THE PRECAVAL SYSTEM OF HYLA CfflRTJLEA. 



B. Innominate. — The innoininate is the median vein^ 

 and is formed by the following : — 



(1) External jugular. This opens into the origin 



of the innominate, a short distance from the 

 junction of the latter with the precaval. It 

 is formed by : — 



(a) Internal jugular, which returns blood from 



the head ; and the 



(b) Mandibular, which comes from the lower 



jaw and into which, near the susi^ensorium. 

 runs the maxillary vein from the upper 

 jaw. 



(2) Subscapular. This vessel runs from the 



muscles of the shoulder, and receives a veia 

 which returns blood from the muscles of the 

 shoulder and the skin. It is proposed to 



term this vessel the somatic vein. 



C. Subclavian. — The sul)clavian is the most posterior 

 vein, and is formed by the following : — 



(1) Brachial, which comes from the arm ; 



(2) Musculo-cutaneous, which returns blood from 



the walls of the abdomen and the skin ; and 

 the 



(3) Coracoid, a small vein running into the sub- 



clavian, from the coracoid region. 



In Southern Universities an allied species, H. aurea, is used 

 in teaching anatomy. On comparison of the precaval 

 system of H. ccerulea with that of H. aurea, it is found that 

 both agree in the possession of a coracoid vein, though 

 Dr. Sweet (5) says that in H. aurea it is not always present, 

 and two may occur. Another point of resemblance is the 



