To face p. 369 



(1) Archiguiana. 



(2) Archamazona. 



Red, lines of primary origin of South American 

 fresh-water fishes, n, from the ocean, b, from the hypothet- 

 ical Antarctic continent, e, from the hypothetical Helenis. 

 (l), (2), (7), (8) and (9), primary centers of radial mi- 

 gration. Green, lines of migration from the primary centers. 

 (3), (4) and (5), secondary centers of radial migration. 

 Blue, lines of migration from the secondary centers. (6), 

 tertian- center of radial migration. Brmun, lines of mi- 

 gration from the tertiary center. 



MAP TO ILLUSTRATE THE MIGRATIONS OF SOUTH AMERICAN FRESH-\VATER FISHES. 



