The range of cranial capacities in the following ancestral forms were

(a) Australopithecus

(b) Homo habilis

(c) Homo erectus

(d) Cro-magnon

(e) Homo sapiens sapiens

(a) Australopithecus → 450 to 600 cm³

(b) Homo habilis → 680 to 735 cm³

(c) Homo erectus → 800 to 1125 cm³

(d) Cro-magnon → 1450 to 1600 cm³

(e) Homo sapiens sapiens → 1450 to 1600 cm³