. Journal of morphology . 30. Spermatozoon with middle piece a little more swollen, x 2(X)0. 31. Spermatozoon with the first indication of rays. Notice a knob atthe end of the tail. X 2000. 32. Middle piece with a pentagonal outline. X 2000. 33. The same preparation further extracted. The middle piece has lostits outline, the centriole alone remaining as a distinct body. Elongationof the tail, x 2000. 34. Middle piece surrounded by long rays. X 2000. 35. Centriole with ray-system escaped from the middle piece 2000. 36. Centriole just after its division. Tlie middle piece vesicle is a
. Journal of morphology . 30. Spermatozoon with middle piece a little more swollen, x 2(X)0. 31. Spermatozoon with the first indication of rays. Notice a knob atthe end of the tail. X 2000. 32. Middle piece with a pentagonal outline. X 2000. 33. The same preparation further extracted. The middle piece has lostits outline, the centriole alone remaining as a distinct body. Elongationof the tail, x 2000. 34. Middle piece surrounded by long rays. X 2000. 35. Centriole with ray-system escaped from the middle piece 2000. 36. Centriole just after its division. Tlie middle piece vesicle is aboutto disappear, x 2000. 37. Sperm asters with new ray systems. No centrosome is present. X 2000. 38. Sperm asters with a synthetic spindle between them. X 2000. 39. Sperm aster with much centroplasm. X 20(X). 40. Sperm aster more advanced. Two centrioles in a degenerating centro-some. The rays are about to disintegrate (only a portion of the rays arerepresented), x 2000. JKINESIS IN CEKEBRATULUS iTK Journal of Mniti-noLOGY.—Vol. XX, No. 3. Plate III. 41. Two germ-nuclei immediately prior to their conjugation. The sperm-spindle lies between the nuclei, x 86G. 42. Two germ-nuclei opposing each other. The sperni-spindle is behindthe nucleus. X 8GG. 43-44. Two sections (not consecutive) of germ-nuclei fused. Two cen-trioles are present. Position of the centrioles in the degenerating ray systems have appeared around the centrioles. X 86G. 45. Two germ-nuclei opposing but not yet fused. A centriole (sketchedin from the next section) has already acquired a new ray system. X 86G. 4G. Segmentation nucleus with the sperm-spindle on one side. X 8GG. 47. Centrosome containing two centrioles at a pole of the first cleavagefigure. X 2000. 48. Centrioles separated farther from each other with two connectingfibres between them. X -000. 49. Centrosome enlarging. X -000. 50. Centrosome still enlarging, its alveolar nature becoming apparent. X 2000. 51. C
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