THE CHROMOSOME COMPLEX OF CULEX P1PIENS. 301 
EXPLANATION OF PLATE 20, 
Illustrating Miss Monica Taylor's paper on “ The Chromosome 
Complex of Culex pipiens. — II: Fertilisation.” 
All figures were drawn with the Abbe camera to the given scales 
(Leitz y 1 , oil imm., Zeiss compensating oculars). 
Fig. 1. — Section through egg fixed Gil. Pet. Stained in thionin ; 
differentiated to show “ yolk nuclei.” “ Yolk nuclei ” remain deeply 
stained ; chromosomes lose stain when sections are left for some time 
in absolute alcohol. 
Fig. 2. — Section through egg of a raft laid at 4.15 a.m. ch. Chorion. 
c. m. Closed micropyle /. Funnel. s. p. n. Segmentation resting 
nucleus surrounded by mass of protoplasm, v. m. Vitelline membrane. 
Fig. 3. — Resting nuclei ; daughter nuclei of fertilisation nucleus ; 
“ yolk nuclei ” around yolk globules. 
Fig. 4. — Prophase of segmentation nucleus ; egg one hour old. 
Fig. 5. — Prophase. 
Fig. 6. — Early prophase. 
Fig. 7. — Prophase. 
Fig. 8. — Prophase. 
Fig. 9. — Early prophase. 
Fig. 10. — Metaphase. 
Figs. 11 and 12. — Anaphase. 
Fig. 13. — Telophase. 
YOL. 62, PART 3. — NEW SERIES. 
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