448 



CHARLES F. SILVESTER 



Sixteen different species of Old World monkeys have been 

 examined and no indication of these reno-caval communications 

 have been found. Their uniform presence in the New World 

 forms is a fact which further serves to establish the wide separa- 

 tion supposed to exist between these two groups of Primates. 



The species which form the material for the present paper 

 belong to the families Cebidae and Callitrichidae, and are dis- 

 tributed among seven of the twelve genera of New- World mon- 

 keys. 



The following table- shows the genera and species examined. 

 Genera indicated in italics have not been examined. 



Family Cebidae 



Alouata seniculus 



Ateles variegatus 



Ateles ater 



Ateles hybridus ; 



Ateles vellerosus 



Brachyteles 



Lagothrix 



Cebus hypoleucus 



Cebus capucinus 



Pithecia 



Cothurus 



Callicebus 



Saimiris sciurea 



Nyctipithecus trivirgatus 



Family Callitrichidea 



Callithrix jacchus 



Midas oedipus 



NOMBER OF 



INDIVIDUALS 



EXAMINED 



1 

 1 



2 

 2 

 1 

 

 

 10 

 3 

 

 

 

 1 

 1 



1 



2 



THE VEINS 



The postcava and its tributaries present the normal Primate 

 arrangement. The left renal vein, as a rule, enters the postcava 

 somewhat cranial to the right, although the left kidney is usually 

 situated slightly caudad of the right kidney. This, as well as 



2 Nomenclature taken from E. L. Trouessart, Catalogus Mammalium, 1904. 



