FlG. 31. Amoeboid movements of young egg-cells, a, Amoeboid ovum of Hydra 

 (from Balfour, after Kleinenberg) ; 6, early ovum of ToxopneusUs variegatus, with 

 pseudopodia-like processes (from Balfour, after Selenka) ; c. ovum of Toxopneustes 

 lividuS) more nearly ripe (from Balfour, Hertwig). A i to A 4, the primitive egg-cell 



) , . , 



of a Chalk-Sponge (Leuculmis echinus), in four successive conditions of motion* 

 B i to B 8, ditto of a Hermit-Crab (Chondracanthus comutus\ in eight successive 

 stages (after E. von Beneden). C i to C >, ditto of a Cat, in five successive stages 

 (after PflUger). D, ditto of Trout ; E, of a Hen ; P, of Man. The first series is take* 

 from the Encycl. Brit. ; the second from HackeVt Evolution of Man. 



