178 



ELEMENTS OF MAMMALIAN ANATOMY 



B 



Fig. 89. — Diagrams Showing the Development of the Postcava in the 

 Cat. (From Hytnan's Laboratory Manual of Vertebrate Anatomy, after Htinling- 

 ton and McClure.) 



Crosshatching, cardinal system of veins and their derivatives; close stippling, 

 subcardinal system of veins and their derivatives; cross, vertical, and oblique 

 hatching combined, hepatic veins; open stippling, supracardinal system of veins 

 and their derivatives; vertical hatching, the renal collar. 



Figs. A-G inclusive, showing various stages of development of the veins in 

 the cat. a, precardinal; b, postcardinal; (thoracic division) ; c, postcardinal (lum- 



