PLATE, 2 
EXPLANATION OF FIGURES 
14, 15. Penetration stages, twenty-five minutes after laying. Note the turn- 
ing of the inner sperm bulb. 
16 to 18. Twenty-seven minutes after laying. The middle piece is shown 
in fig. 17. In 16 and 18 the middle-piece was found in adjacent sections. 
19 and 20. Thirty minutes after laying, telophase, first maturation division. 
The sperm head is still within the zone of oil drops and without an aster. 
21 to 22. Thirty-two minutes after laying; early prophase, second maturation 
division. 
21. The sperm head is at right angles to a radius of the egg, the aster forms 
around the granule at the tip of the sperm head. 
22. Formation of sperm aster within the endoplasm. 
23. Thirty-five minutes after laying. The amphiaster is in contact with the 
egg aster. The spermatozoon is in an adjacent section. 
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