LIST OF FIGURES 



XXI 



CHAPTER VIII 



FIG. , 



i68. Geometrical relations of cleavage-planes in plants 



169. Cleavage of Synapta . 



1 70. Cleavage of Polygordius 

 Cleavage of Nereis 

 Variations in the third cleavage 

 Meroblastic cleavage in the squid 

 Rudimentary cells in Aricia 

 Teloblasts of the earthworm 

 Contradiction of Hertwig's rule in Ascaris 

 Bilateral cleavage in tunicates 



178. Bilateral cleavage in Loligo . 



1 79. Eggs of Loligo 



180. Eggs and embryos of Corixa 



181. Variations in axial relations of Cyclops 



171. 



172, 



173 



174, 



175' 

 176 

 177 



363 

 365 

 367 

 369 

 376 

 372 

 j7^ 

 374 

 376 

 380 



381 

 382 



383 

 385 



CHAPTER IX 



182. Half-embryos of the frog .... 



183. Half and whole cleavage in sea-urchins 



184. Normal and dwarf gastrulas of .■^;«/>///().r//.f . 



185. Dwarf and double embryos of .-^w//i/ar/« . 



186. Cleavage of sea-urchin eggs under pressure . 



187. Cleavage of yVi?yi?/.y-eggs under pressure 



188. Diagrams of cleavage in mollusks and polyclades 



189. Partial larvos of ctenophores 



190. Partial cleavage in Ilyanassa 



191. Double embryos of frog .... 



192. Cleavage in Crepidula .... 



193. Normal and modified larva; of sea-urchins . 



194. Regeneration in coelenterates 



400 

 407 

 408 

 409 

 411 

 412 

 414 

 418 

 420 

 421 

 424 

 428 

 429 



