222 I The Process of Evolution 



Fig. 10.4 I Cichlid fishes (Haplochromis) from Lake Victoria, Africa. 

 Top, H. macrops; center, H. haijoni; bottom, H. cavifrons. These fishes 

 are approximately 100, 180, and 145 mm long, respectively. [After 

 Boulenger, 1915, Catalogue of the Fresh-water Fishes of Africa in the 

 British Museum {Natural History) III.] 



