(EXOTIIEHA MTIT. LATA AND (L. MUT. SEMH.ATA. 567 
Somatic Mitosis. 
X indicates the odd or impaired chromosome. 
PLATE 35. 
CE. semi lata. 
Pig- 1. — Prophase showing 15 chromosomes and nncleolns. 
Fig. 2. — Prophase showing 15 chromosomes and two nucleoli. 
Fig. 3. — Metaphase. Polar view showing 15 chromosomes. 
Fig. 4. — The same, one chromosome having a curious iirolongation. 
Fig. 5. — The same, one chromosome much smallei- than the other 14. 
Fig. 6. — Metaphase. Polar view, showing the paired arrangement of 
the chromosomes. 
Fig. 7. — Metaphase. Similar group to that shown in fig. 6. One of 
the chromosomes is dumbhell-shaped. 
(E. biennis lata. 
Fig. 8. — Metax^hase showing gronx) of 15 chromosomes, one of 
which is very much shorter and one rather longer than the average 
chromosome. 
Fig. 9. — A similar gronx^ of 15 chromosomes, one of Avhich has a 
small x^iece constricted from it. 
(E. lata. 
Fig. 10. — Polar view of metaxihase showing 15 chromosomes, one of 
which apx^ears very much shorter and thicker than the remaining 14. 
Fig. 11. — Polar view of metax^hase showing excexitionally strong 
Xiairing in a groux) of 15 chromosomes. 
(E. lata. 
Fig. 12. — An excex^tional groux? of 15 chromosomes, in which 9 show 
a distinct light area, usually near their middle x^oints. 
Fig. 13. — A similar groux^ of 15 chromosomes, all of ivliich show this 
light area. 
(E . semilata. 
Fig 14. — Metax^hase in x^olar view. Seventeen or 18 chromosomes, 
some of which are sx^litting at one end only. See text. 
(E . lata. 
Fig. 15. — Metax^hase in x^olar view, showing 15 chromosomes. A 
strongly x^aired groux:), two chromosomes of one x^air with a x^recocious 
sx^lit. 
VOL. 59^ PAET 4-. NEW SEKIES. 
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