THE "ACCESSORY CHROMOSOME" IN EPEIRA

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Abstract
1. The spermatogonia contain twenty-three chromosomes, twenty-two ordinary ones and the odd chromosome. 2. The odd chromosome is the chromosome-nucleolus of the growth period. 3. In the first maturation-division the odd-chromosome passes undivided to one pole, the eleven ordinary chromosomes dividing by a reduction-division. 4. The second maturation division is an equation division, in which the old chromosome participates. 5. Resulting from the first division are two types of secondary spermatocytes (1) containing eleven chromosomes, plus the odd chromosome, and (2) containing only eleven chromosomes. Resulting from the second division are two types of spermatozoa (1) containing eleven chromosomes, plus tile odd chromosome, and (2) containing only eleven chromosomes. These two types of spermatozoa exist in equal numbers.

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