LIST OF FIGURES 



XXI 



FIG. 



i68. 

 169. 

 170. 

 171. 

 172. 



173- 

 174. 



175- 



176. 



177. 

 178. 

 179. 

 180. 

 iSi. 



CHAPTER VIII 



Geometrical relations of cleavage-planes in plants 



Cleavage of Synapta .... 



Cleavage of Polygordiiis 



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 



Bilateral cleavage in Loligo . 



Eggs of Loligo ..... 



Eggs and embryos of Corixa 



Variations in axial relations of Cyclops 



PAGE 



365 

 367 

 369 

 370 

 11^ 



■\m -% 

 J/ J 



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 .-iw//z/^jr«5 . 



185. Dwarf and double embryos of ^;;/////£'a-?^5' . 



186. Cleavage of sea-urchin eggs under pressure . 



187. Cleavage of A^'^rm-eggs under pressure 



188. Diagrams of cleavage in mollusks and polyclades 



189. Partial larva; of ctenophores 



190. Partial cleavage in Ilyanassa 



191. Double embryos of frog .... 



192. Cleavage in Crepidula .... 



193. Normal and modified larvre of sea-urchins . 



194. Regeneration in coelenterates 



400 

 407 

 40S 

 409 

 411 

 412 



414 



418 

 420 

 421 

 424 

 428 

 429 



