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305
= c d
Fig. 1. Heterotypic spindle of the Caninae: a. R. sicula Tratt. First stage of
metaphase; 7 bivalents arranged in the equatorial region, 21 singles irregularly
scattered on the spindle 5b. RH. (Glaucae) Jebei At. Both bivalents and singles
in the equatorial plate. c. R. (Glaucae) contracta Matss. The partners of the 7
bivalents pass to the poles, the 21 segmented singles still in tbe equatorial plate.
d. RH. (Villosae) Grenieri Dgl. The partners of the 7 bivalents on the poles, the
halves of the 14 singles in anaphase stage. — Obj. Leitz ;’;, comp. ocular 18;
the figures reduced ! in reproduction.
of the single chromosomes enter the telophase nuclei, but some
of them remain in the cytoplasm and are included in smaller
nuclei (fig. 2 c) For that reason, at the second division, several
spindles are found, the smaller of them containing only chromo-
somes derived from the univalents, the two great spindles contain-
ing in addilion the 7 partners of the bivalents.
The second division is of the same type as the first, but there
Svensk Botanisk Tidskrift. 1920. 20
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