110 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



EXPLANATION OF PLATES 



All figures were drawn from living material with the aid of the camera lucida. 

 The absolute scale is given on each plate. 



PLATE 16 



Stages in the fertilization of the egg of Monoblepharella Taylori 

 and the emergence of the zygote. 



Figs. 1, 2. Emergence of the last of four antherozoids from the 

 antheridium. 



Figs. 3-6. Absorption of the antherozoid by the egg. In Fig. 6 

 all but a small portion of the male gamete and its 

 cilium has sunk into the ooplasm. The cilium has as- 

 sumed a lateral position. 



Fig. 7. Beginning of emergence of the zygote. 



Figs. 8-10. Further stages in emergence. 



Fig. 11. Completely emerged, somewhat ellipsoidal zygote 

 resting at the mouth of the oogonium. 



Fig. 12. Zygote assumes a more spherical shape and moves 

 away from the orifice of the oogonium. 



Errata: Plates 16 and 17 are transposed. 

 With this correction, all references to both 

 plates are accurate. 



