48 



Figa. 45-47 » Spermatid from different view points show- 

 ing the mitochondria, mt. and a granule. In "bottom of cap- 

 sule. 



Plg» 48« Spermatid with mitochondrial ring completed. 



Pigs. 49-60. Spermatids showing stages In the develop- 

 ment of the central "body and the Inner tuhule within the cap- 

 sule. A clear space appears for a time "between the capsule 

 and the nucleus. 



Pig. 61. Mature sperm, fixed In vapor of osmic acid and 

 stained In gold chloride preparation, n.c, nucleus cup; p.s., 

 pseudopodla; c, wall of the capsule; c.c, cavity of the 

 capsule; l.t., inner tubule; l.t.c. Inner cavity of the 

 Inner tuhule; c.b., central body; o.c. outer cavity of the 

 inner tubule. 



Pig. 52. Sperm viewed from the top, mounted In 4% M0„. 



Fig. 63. Sperm mounted In the serum of the crab's blood. 



Pig. 64. Side view of sperm In the serum of the blood. 



Pig. 65 . Sperm in serum with pseudopodla all turned to 

 one side by currents In the serum. 



Pig. 66. Sperm in testicular tubule. Fixed in Worcester's 

 fluid. Stained In Iron-haematoxylln, central body projecting 

 from the top. 



Pig. 67. A sperm treated with 3% EIO.'^, fixed with Morgan's 

 fluid and stained with Delafleld's haematoxylln. 



Fig. 68. A sperm treated with 3% KtlOs, fixed with Mor- 

 gan's fluid and stained with eosln. 



Figs. 69-85 . Were all drawn from living sperms that had 

 been treated with hjrpotonie solutions of salts, and show 

 various stages in the eversion of the capsule, r.. the collar; 

 c.b., central body; Inv.c. Inverted capsule; g, g-^ and g^, 

 pieces of the central body on the everted wall of the inner 

 tubule. 



Figs. 86-87 . Sperms that were exploded in distilled water 

 and fixed in Morgan's fluid then stained with thlonln and 

 eosln. 



Figs. 88 to 92 . F.verted sperms extending through the shell 

 of the egg, from the lumen of the ovary; fixed in Morgan's 

 fluid. In Fig. 89 the shell of the egg Is badly warped, c.b. 

 ejected central body; Inv.c, Inverted capsule; n.c, nuclear 

 cup; r., collar of the capsule. 



