A Small Chromosome in Ascaris megalocephala. 
131 
Fig. 12 shows the equatorial plate of cell Po (Boveui '99; of the germ 
track; Fig. 13, of cell P4; Fig. 14 of a spermatogonium. All the other hgures 
represent the chromosomes of the dividing egg. In Fig. 10 the sister-chromo- 
somes have moved a little apart; Fig. 11a, b shows the two groups of daughter- 
chromosomes of a dividing egg. 
Fig. 7 is from an egg of bivalens, where the second polar body (PB) has 
received all the chromatin of the second spindle, 4 rods instead of 2; conse- 
quently the first cleavage spindle shows only the paternal chromosomes. 
Fig. 8 shows the chromatin of an egg of bivalens, Into which no Sper- 
matozoon seems to have entered. No spheres are present. The chromosomes 
to be seen must be of maternal origin. 
Fig. 9 shows a case, in which the second polar body (PB) contains 3 in- 
stead of the normal number of 2 chromosomes; in consequence of this the first 
cleavage spindle shows 3 chromosomes instead of 4. 
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