arnt 
Pa aL LT 
re produces the meee 
%,.. 
; : ote germinate. & 
o marr Us ° 
At re - bearing 2 
° 
° 
Ss san 
& si ion, TEdUCH ID, 
‘eS orien fal 
9 J gent curs. 
Lon 
€ a5 : 
49, G) gem gormeles 
‘ 1x N \ 
h é 
" Ja * 
: N & K x : 
% Ni Zi SN 
. /3 Ne 
pst ve Ny 
» 7. awe RS 
ty Pa & ¥ -] uy 
ae ae 5 tas ays 
yx 3, ~ MOE = 
~ me = Fp 
thy SCs Hye) i) Tag aut 
Fig. 3. Diagram I. Schematic representation of the spermatogenesis and 
alternation of generations in Arenicola. 
Fig.4. Diagram II. Scheme representing the life history of a phaenogam. 
Fig.5. Diagram III. Scheme of the life history of the moss or other bryophyte. 
Fig. 6. Diagram IV. Scheme of the life history of such an alga as Spirogyra 
or such a protozoon as Chamydomonas. 
1031 
