TABLE V. 



Systematic Survey of some of the most important rhythmical variations in 



Egg-cleavage. 80 

 Only the first column (Amphioxus) presents the original, palingenetio 

 cleavage- hythm, in regular geometrical progression. All the other columns 

 show the descended kenogenetic modifications. 



c = parent-cells. s = cleavage-cells. e = exoderm-cells. 



i = entoderm-cells. 



I. 



Lancelet 

 (Amphi- 

 oxus). 



n. 

 Amphibian 

 (Frog). 



ni. 



Mammal 



(Rabbit). 



IV. 



Snail 

 (Trochus). 



v. 



Worm 



(Fabricia). 



VI. 



Worm 



(Cyclogena) 



lc 



lc 



lc 



lc 



lc 



le 



2« 



2s 



2s 



0-e + 10 



Ss 



2s 



(le + 10 



2s 



(le + 10 



4s 



4s 



4s 

 (2e + 2i) 



4s 



3s 



(2e + 10 



3s 



(2e + 1») 



8s 



8s 



(4e + 4i) 



8s 



(4e + 4i) 



8s 

 (4e + 4t) 



5s 



(4e + 10 



4s 

 (3e+ 10 





12s 



(8e + 4a) 



12s 



(8e -f 4i) 



12s 



(8e + 40 



6s 



4e + 2») 



5s 



(4e+ 10 



165 



16s 



(8e + 8*) 



16s 



(8e + Si) 



20s 



(16e + 4i) 



10s 



(8e + 20 



6s 



(5e + 10 





24s 

 (16e + 8t) 



24s 

 (16e + 8*) 



24s 



(16e + 8t) 



lis 



(8e + 30 



7s 

 (6e + 10 



32s 



32s 



(16e + 16t) 



32s 

 (16e + 16i) 



40s 



(32e + 80 



19s 



(16e + 30 



8s 

 (7a + 10 





48s 

 (32e + 16t) 



48s 

 (32e + 160 



44s 



(32e+ 120 



21s 



(16e + 50 



9s 



(8e + 10 



64* 



64s 



(32e + 32i) 



64s 



(32e + 320 



76s 



(64e + 120 



37s 



(32e + 5») 



10a 

 (9a + It) 



- 



96s 



(64e + 32i) 



96s 



(64e + 320 



84s 

 (64e + 20i) 



38s 

 (32e + 6t) 





128s 



160s 



(128e + 32i) 





148s 



<128e + 20i) 



70s 



(64e + 6») 





