224 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



nals and the renal portal is more marked in the female than 

 in the male. Besides the muscular vessels taking part in the 

 anastomosis there are others which join the posterior cardinal 

 along nearly its entire length; these veins are about 6 mm 

 apart and come from between the vertebrae. Each posterior 

 cardinal communicates with the posterior vena cava on the con- 

 vex side of the bend where it leaves the dorsal body wall. Some- 

 times the communicating vessels are separate and enter the post- 

 caval near together. More often the veins from the posterior 

 cardinals unite before they enter the postcaval as already de- 

 scribed, V., PI. 11. 



The Fallopian Veins, F., PL 11, are small vessels which 

 run in a wavy course along the ventral side of the anterior part 

 of each fallopian tube. At the anterior end of each tube the 

 vein joins the posterior cardinal of that side. Besides this prin- 

 cipal vein there are numerous small vessels which pass from the 

 walls of the fallopian tubes to the posterior cardinal veins, Z., 

 PL 11. Opening into the fallopian vein, near its junction with 

 the posterior cardinal, are two or more small branches which 

 come from about the ostium abdominale of the oviducts. 



Taking up now the veins that return the blood from the head, 

 it will be seen that there are three: the internal jugular, the 

 external jugular, and the lingual, on each side. 



The Internal Jugular, Ji., PL 11, is formed principally by 

 the union of two veins ; one of these comes from the roof of the 

 mouth, the other from the brain case, the upper part of the spinal 

 column and the dorsal wall of the pharynx. From the place of 

 union of these two branches, the internal jugular runs poster- 

 iorly to unite with the external jugular about 7 mm anterior 

 to the junction of latter with the Duct of Cuvier. 



The External Jugular, Je., PL 11, receives branches from 

 the external parts of the head and from the ventral wall of the 

 mouth. It is formed for the most part by the union of two 

 veins. One of these, the Naso-JOrbital Vein, N. Or., PL 11, 

 runs across the masseter muscle, receiving branches from the 

 antero-dorsal part of the head and from the eye. The other 



