PLATE 4 
EXPLANATION OF FIGURES 
61 Mature spermatozoon, fixed in vapor of osmic acid and stained in gold 
chloride preparation; n.c., nucleus cup; p.s., pseudopodia; c., wall of the capsule; 
c.c., cavity of the capsule; 7.t., inner tubule; 7.t.c., inner cavity of the inner tubule, 
c.b., central body; o.c., outer cavity of the inner tubule. 
62 Spermatozoon viewed from the top, mounted in 4 per cent KNOs. 
63. Spermatozoon mounted in the serum of the crab’s blood. 
64 Side view of spermatozoon in the serum of the blood. 
65 Spermatozoa in serum with pseudopodia all turned to one side by cur- 
rents in the serum. 
66 Spermatozoon in testicular tubule, fixed in Worcester’s fluid. Stained in 
iron-hematoxylin, central body projecting from the top. 
67 A spermatozoon treated with 3 per cent KNOs, fixed with Morgan’s fluid, 
and stained with Delafield’s hematoxylin. 
68 A spermatozoon treated with 3 per cent KNOs, fixed with Morgan’s fluid 
and stained with eosin. 
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