55' ORILLA STOTLER WERNER. 



PLATE 3. 



FIGS. 13 to 18. Cells from the amnion of females. 



FIG. 13. Prophase. Autosomes from 37 to 33 numbered. 



FIG. 14. Prophase. This cell is atypical in the arrangement of the large chro- 

 mosomes. However, 77 chromosomes are present. 



FIG. 15. Prophase. Autosomes 37 to 33 paired. 



FIG. 16. Prophase. Autosomes from 37 to i. 



FIG. 17. An early metaphase. The W chromosome is bent upon itself. 



FIG. 18. A late metaphase showing especially gonomeric grouping. The most 

 of the large chromosomes in this cell are foreshortened. 



