200 Chromosomes in Pieris and Abraxas 



6, 7. Ist spermatocyte equatorial plates; four small chromosomes in fig. 6, three 

 in fig. 7. 



8, 9. 2nd spermatocyte equatorial plates : three small chromosomes in fig. 8, only 

 one conspicuously small in fig. 9. 



Figs. 10 — 15. Abraxas grossulariata. 



10, 11. Two oogonial equatorial plates, each with 56 chromosomes. 



12. Oocyte after synizesis. Reduced number of chromatin loops. The nucleolus 



and a number of loops are not included in the section. 



13. Slightly later stage ; not all the chromosomes are shown. (26 double chromo- 



somes and two nucleoli were visible in this nucleus.) 

 13a. Nucleolus of similar nucleus stained with Breinl. 



14. Later stage, probably a nutritive cell. Somatic number of short chromosomes, 



most of them split, some lying in pairs. (54 chromosomes and two nucleoli 

 were visible in this nucleus.) 



15. Oocyte, at about the stage of fig. 14, with reduced number (approximately, not 



all shown) of chromatin threads. 

 15a. The two halves of the nucleolus of a nucleus in about the same stage, from 

 which the stain is so far washed out that the chromatin threads were nearly 

 colourless. 



