. Journal of morphology . e in condensing. Centrosomes visible within the , 17. Equatorial plate. Pole view. 28 , 18. Equatorial plate. Side view. Two types of , 19-25. Development of the spermatid. Oniscus asellus Linn. O, 3. Spermatocytic prophase. Origin of centrosomes without the nucleus. Compare Figs. I, 12, 13 and , 4-5. Young spermatids. Hippa talpoides. Hi, 15-16. Spermatocytic prophases. Longitudinal splitting of the chro-matin. Increase of cytoplasm. Hi, 17. Later prophase. Origin of kinoplasm within the nucleus. Hi, 18. Later prophase. Chromo
. Journal of morphology . e in condensing. Centrosomes visible within the , 17. Equatorial plate. Pole view. 28 , 18. Equatorial plate. Side view. Two types of , 19-25. Development of the spermatid. Oniscus asellus Linn. O, 3. Spermatocytic prophase. Origin of centrosomes without the nucleus. Compare Figs. I, 12, 13 and , 4-5. Young spermatids. Hippa talpoides. Hi, 15-16. Spermatocytic prophases. Longitudinal splitting of the chro-matin. Increase of cytoplasm. Hi, 17. Later prophase. Origin of kinoplasm within the nucleus. Hi, 18. Later prophase. Chromosomes mostly U or V-shaped. ISIitochon-dria in the cytoplasm. Hi, 19. Late prophase of the first spermatocyte. Kinoplasm within thenucleus. Hi, 20. Metaphase. Pole view. GO chromosomes. Hi 21. Metaphase. Side view. Astacus fluviatilis. A, 4. Prophase of the lirst spermatocyte. Polarity of chromatic loops. Mitochondria in the , 5. Spermatocytic metaphase. STUDIES IN CRVSTACEAN SPERMATOGENESIS,^r. LOUISE TlIC JOLUXiL OF MliIiiiIOLOGY.—VoL. XX. No. Plate talpoides. Hi, 22. Young spermatid. Hi, 23. Abnormal spermatid. Hi, 24. Development of mitochondrial ring and of the strands which will become the streamers of the , 25. (a) Differentiation of tail-capsule and decoloration of nucleus. (b) Pole view. Hi, 2G-2S. Development of tail-capsule, tube, ring and plug. In these figures the streamers are not , 29. Elongation of the capsule. Condensation of x. Appearance of , 30. a, Later stage, b, c and d, variations in the appearance of xl e and f, cross sections in the region of the nucleus and of , 31. a, Stage very nearly the same as 29, but of somewhat different aspect, b, cross section of , 32-34. Final stages in the development of the spermatid. Homarus vulgaris. Ho, 8. Spermatid before the formation of the tube. Ho, 9. (a) and (b). Cross sections showing manner of formation of tube. (c) In the region of
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