404 WILSON. 



EXPLANATION OF PLATE XXIV. 

 {Hircinia acuta.) 



Fig. 116. Section of immature ovum, surrounded by numerous mesoderm 

 cells. D.4. 



Fig. 117. Section showing mature (as to size) ovum in situ. A.4. 



Figs. 118, 118'. Two sections of mature ova showing stages in the extrusion 

 of the second nucleolus. D.4. 



Fig. 119. Section through part of ripe egg with surrounding follicle. D.4. 



Fig. 120. Section through segmenting egg. C.4. 



Figs. 121, 122. Sections of morulas. C.4. 



