TABLE III. 



List of the moat important differences in Animal Egg-cleavage and 

 Gastrolation. 79 



The letters a-f indicate the 6 animal tribes (the primitive animals being 

 excluded) : a, Plant-animals ; b, Worms ; c, Soft-bodied animals (Mollusta) ; 

 d, Star-aiiitnals (Echinoderma) ; e, Articulates (Arthropoda) ; /, Vertebrates. 



Gastrula with 



nutritive yelk. 



Mcroyastrula. 



IV. Superficial Cleavage. / o. A few Sponges (?). 

 (Segmentatio tuperjicialis .) 1 Alcyonium (r). 



I 6. Individual Worms (?) 



Periblastic eggs. 

 Bladder-gastru'a. 



] . The great majority of Artlcu- 

 lates (Arthropoda) Cms- 



Myriopods ' Spidere - 



