PLATE 2 
A. — Zea mays L. Tepic. Late heterotypic prophase. 
B. —Euchlaena mexicana Schrad. Heterotypic prophase. 
C. — Coix lachryma jobi L. S. P. I. No. 48867. Heterotypic prophase. 
D. — Zea mays L. Chinese waxy. Late heterotypic prophase. 
E. — Euchlaena mexicana Schrad. Heretotypic metaphase. 
F. — Coix lachryma jobi L. S. P. I. No. 48862. Heterotypic metaphase. 
G. — Coix lachryma jobi L. S. P. I. No. 48867. Late heterotypic prophase. 
H. — Euchlaena mexicana Schrad. Heterotypic anaphase. 
I. —Coix lachryma jobi L. S. P. I. No. 48867. Heterotypic anaphase with 
an extra chromosome lagging in its division. 
J. —a. The 10 bivalent chromosomes from PI. 2, A, arranged according to size. 
b. The 10 bivalent chromosomes from PI. 2, D, arranged according to size. 
c. The 10 bivalent chromosomes from PI. 2, G, arranged according to size. 
K. — Euchlaena mexicana Schrad. Early heterotypic anaphase. 
L. — Coix lachryma jobi L. S. P. I. No. 48862. Homotypic metaphase. 
