PLATE 2 
EXPLANATION OF FIGURES 
23 Section of pickerel testis near periphery. Con.lis.nuc., connective tissue 
nucleus; g.c., germ cells; lob., lobule; sp.m., sperm mass. 
24 Section representing part of a lobule in sun fish testis. con.tis.nuc., 
connective tissue nucleus; g.c., germ cells; spg.c., developing cyst of spermato- 
gonla. 
25 Camera lucida drawing of a single lobule of a perch testis during period 
of transformation. XX 680. g.c., germ cells; div.g.c., dividing germ cells: 
trans.g.c., transforming germ cells; spg., spermatogonia; div.spg., dividing sper- 
matogonia; lob.w., wall of lobule. 
26 Camera lucida drawing of peripheral portion of perch testis. X SSO. 
Material fixed November 15. prim.g.c., primitive germ cells; spg., spermato- 
gonia; div.spg., dividing spermatogonia; sp.td., spermatid; spz., spermatozoa, 
syn., nuclei during contraction stage of synapsis; fes.wall, testis wall. 
27 Camera lucida drawing of a portion of germ cell cord. X 567. g.c., germ 
cells; con.tis., connective tissue. 
28 Camera lucida drawing of peripheral portion of perch testis. X 680. 
Material fixed July 3. bl.c., blood cells; bl.v., blood vessel; con.tis.nuc., connec- 
tive tissue nucleus; con.tis.fib., connective tissue fiber; lob.w., wall of lobule: 
m.g.c., Migrating germ cell; s.g.c., stationary germ cell; tes.wall, testis wall; 
spr.sp., space formerly occupied by spermatozoa. 
* 29 Camera lucida drawing of section of peripheral portion of perch testis 
< 680. Material fixed May 5. mz.g.c., migrating germ cell; s.g.c., stationary 
germ cell; bl.cell, blood cells; elas. fib., elastic fiber in testis wall. 
30 Camera lucida drawing of section of perch testis at periphery. X 680. 
Material fixed August 5. ad.t., adipose tissue; bl.v., blood vessel; g.c., germ 
cells; lob.wa., wall of lobule; tes.w., wall of testis. (Note: figures 31 to 42 are 
drawn to the same scale. ) 
708 
