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No. 3. — The Spermatogenesis of Phrynotettix magnus, with special Reference to Synapsis and the Individuality of the Chromosomes. By D. H. Wenrich. contributions prom the zoological laboratory of the museum op comparative zoology at harvard COLLEGE. No. 266. TABLE OF CONTENTS. I. Introduction A. Outline of the problems B. Material and acknowledgments II. Observations A. Outline of spermatogenesis: nomenclature a. Introductory ..... b. Outline of successive stages 1. 2. 3. 4. 5. Spermatogonia Primary spermatocytes Secondary spermatocytes Spermatids Spermatozoa c. Additional features B. Synapsis a. The postspireme stages 1. Chromosome-pair A 2. Chromosome-pair B 3. Chromosome-pair C h. The conjugation of chromosomes . 1. The formation of leptotene threads 2. The zygotene stages 3. The pachytene stages C. The individuahty of the chromosomes . a. The selected chromosome pairs 1. Chromosome-pair A 2. Chromosome-pair B 3. Chromosome-pair C b. The accessory chromosome c. The spermatogonia! divisions d. The somatic nuclei D. Summary of observations PAGE. 68 58 60 60 60 60 61 61 61 63 64 64 64 65 65 66 69 70 72 72 74 75 76 76 76 79 84 86 87 91 92

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• http://biostor.org/reference/945
• 2748026

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The spermatogenesis of Phrynotettix Magnus with special reference to synapsis and the individuality of the chromosomes

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