The Journal of experimental zoology . b Fig. a, b, metaphase-groups, first division; c, metaphase-group, second division; d, entire chro-mosome-group, second division, in side view, showing equal division (three chromosome-pairs from alower level of the spindle shown at the right); c, /, duplicate sister chromosome-groups, anaphase ofsecond division, from the same spindle; g, h, spermatogonial metaphase-groups. somes each (Fig. Jq, 7), the idiochromosomes being well differ-entiated. The first division, however, agrees with Montgomerysdescription in showing either 9 (Fig. Jo) or 8, th
The Journal of experimental zoology . b Fig. a, b, metaphase-groups, first division; c, metaphase-group, second division; d, entire chro-mosome-group, second division, in side view, showing equal division (three chromosome-pairs from alower level of the spindle shown at the right); c, /, duplicate sister chromosome-groups, anaphase ofsecond division, from the same spindle; g, h, spermatogonial metaphase-groups. somes each (Fig. Jq, 7), the idiochromosomes being well differ-entiated. The first division, however, agrees with Montgomerysdescription in showing either 9 (Fig. Jo) or 8, the smallest chro-mosome bemo; in the latter case wanting. ... ^ . The conditions in Nezara are of particular mterest from a comparative point of view in that the uhochromosotnrs are of equal Studies on Chromosomes. 383 size. The first spermatocyte-division shows 8 chromosomes,which differ in grouping from that of the other forms in that allusually lie in a ring without a chromosome at its center (Fig. 4a, b). For this reason no clue
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
