PLATE II. 



MocoR Mdcedo. 



Figures 25-35. (Obj. A. oc. 4.) 



Figures 25-32. Stages in conjugation between (+) and (— ) zygophores from a 

 zygosporic line. The drawings were made with the aid of a camera lucida and 

 beginning with 10 a.m., the stages were taken at the intervals noted. The dots 

 in Figure 30, (d) and (e), indicate the position of the ends of the zygophores at 

 2.15 P.M. 



Figure 81. Condition two minutes before contact of zygophores at (d) showing 

 slight bulging in the apposing walls. 



Figure 33. Horizontal view of zygophoric hyphae from a zygosporic line. 



Figure 34. Zygote showing centrifugal dissolution of intervening wall between 

 the two gametes. 



Figure 35. Mature zygospore. 



CUNNINGHAMELLA ECHINULATA. 



Figures 36-39. Stages of hybridization between (+) hyphae of C. echinulata 

 and (— ) hyphae of Mucor v. (Obj. 7. oc. 4.) 



