CHROMOSOMES, flEREDI'I’Y AND SEX. 
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Oogenesis and spermatogenesis of the hermaphrodite generation 
of Rhahdonema nigrovenosum. (After Boveri.) Ooge- 
nesis on left, spermatogenesis on right. Heterochromosomes 
hlack. (1) and (2) Primary oocyte and spermatocyte prophases; 
(3) and (4) danghter-gronps of first maturation division; (5) and 
(6) ecpiatorial plates of second maturation division ; (7) and (8) 
diagrammatic side views of same stage; (9) and (10) anaphases 
of second maturation division. According to Schleip one of 
the heterochromosomes is included in one daughter-group, the 
second is left out entirely. 
