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

 (from Balfour. after Kleinenberg) ; b, early ovum of Toxopnenstes varifgaius^ with 

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

 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. 

 Bl to B8, ditto of a Hermit-Crab (Chondracanihus cornutus), 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 ; F, of Man. The first series is taken 

 from the Encycl. Brit. ; the second from Hackel's Evolution of Man. 



