Fig. 2i8, A-F. — Oocytes and nutritive cells in insects. A, the earwig Forficula; one oocyte 

 and one nutritive cell, the latter apical, in each group; nucleus of nutritive cell becomes highly 

 branched (after Korschelt, 189 1). B, parthenogenetic, and C, winter, oocyte of plant louse, 

 Melanoxanthum, connected with nutritive cells by protoplasmic strand (from Tannreuther, 

 1907, reproduced in Child, 19156). D, Dytiscus; oocyte with intranuclear ring and seven of 

 the fifteen nutritive cells all cytoplasmically continuous (after Nusbaum-Hilarowicz, 19 18). E, 

 early, and F, later, stage of oocyte development in queen bee (schematized after Paulcke, 1901). 



