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

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

 pseudopodia-like processes (from Balfour. after Selenka) ; <j 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 (Chondraaatithus comutus), in eight successive 

 stages (after E. von Beneden). C I to Cs, 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 Encyd. Brit. ; the second from Hackel's Evolution of Man. 



