106 DEVELOPMENT OF THE SYSTEMIC LYMPHATIC VESSELS 



mined by Silvester"^" for the whole group of the Cebidae, and those 

 found by myself in Macropus rufus. And yet these differences, 

 established and maintained within the natural limits of the 

 mammalian class, cannot, in whatever degree they actually exist, 

 in individual forms be basic. In any given manmialian type, 

 the systemic lymphatic vessels, whatever their adult relation to 

 and connection with the venous system may be, must develop 

 in accordance with a genetic ground plan common to all mammalia. 



" C. F. Silvester. "On the Presence of Permanent Lymphatico-Venous 

 Communications at the Level of the Renal Veins in Adult South American 

 Monkeys." 



Ayiat. Anz., Erganzungsh. . z. .37. Bd., Vevh. Anat. Ges., 24 Vevs., Briissels, 

 1910, S. 111-114. 



