PLATE 3 
EXPLANATION OF FIGURES 
33 to 36 Spermatids with vacuoles in the cytoplasm; c.a., mass of finely 
granular cytoplasm which may be the mitochondria. 
37 Spermatid with vacuole or capsule and nucleus; the periphery of nucleus 
more densely stained than center. 
38 Spermatid showing a small clear vacuole in the nucleus. 
39 to 42 Later stages in the transformation of the spermatids; mt., mitochon- 
drial substance. 
43 Spermatid showing two sides of a dark ring, d., in the capsule; mt. mito- 
chondria, also the central body on the nucleus at the bottom of the capsule. 
44 Spermatid showing two granules on the border line between the nucleus 
and capsule. 
45 to 47 Spermatid from different view points, showing the mitochondria, 
mt., and a granule, in bottom of capsule. 
48 Spermatid with mitochondrial ring completed. 
49 to 60 Spermatids showing stages in the development of the central body 
and the inner tubule within the capsule. A clearspace appears fora time between 
the capsule and the nucleus; 7.f., a vacuole which forms the inner tubule; c.b., 
central body; n., nucleus. 
188 
