XX 



LIST OF FIGURES 



FIG. 



124. 



125. 



126. 



127. 



12S. 



120. 



130. 



131- 

 J32. 



« 33- 

 134- 

 '35- 

 136. 

 137- 

 138. 

 139- 

 140. 

 141. 

 142. 



Diagrams of tetrad-forniatiDii in artliropods 



llciniinal vesicles and tetrads 



Maturation in Aiiasa .... 



Maturation in Anasa .... 



1 >ia_L;ranis oi retiuction 



Maturation in Iluiltisscma . 



Maturation in Iltalasseina and Zirphaa 



Maturation in Salainandra . 



The maturation-divisions in angiosperms 



Maturation in IJlium .... 



Maturation in lilitim .... 



Diagrams of reduction in the flowering plan! 



Ovary of Canthocaiiiptus 



Polar spindles without centrosomes 



Polar bodies in Actinophrys 



Polar bodies in Aclinosphitrium . 



Conjugation and reduction in Closlcriiim 



First type of parthenogenetic maturation in 



Second type of parthenogenetic maturation 



Artemia 

 in Arteniia 



251 



252 



254 

 255 

 259 

 260 

 261 

 262 

 264 

 266 

 268 

 270 



273 



276 



278 

 278 



279 



282 



283 



CHAPTER VI 



143. Abnormalities in the fertilization of ^5f(7r?.y 



144. Giant embryo of Ascaris ...... 



145. Individuality of chromosomes in Ascaris 



146. Independence of chromosomes in fertilization of Cyclops 



147. Hybrid fertilization of Ascaris ..... 



148. Mitosis with intranuclear centrosome in Ascaris . 



149. Abnormal mitoses in Hemerocallis .... 



150. Centrosomes in Chcetopterus and Cerebratulus 



151. Artirtcially produced asters and centrosomes in echinoderms 



152. Diagram of different types of centrosome and centrosphere 



153. Polar mitoses in Diaidula ....... 



154. Astral systems in Unio ....... 



155. Astral systems in Cerebratulus and Thalassema . 



156. Structure of the aster in spermatogonium of salamander 



295 

 296 

 297 

 298 

 300 



305 

 306 



307 

 308 

 310 

 312 



313 

 320 

 326 



CHAPTER VII 



157. History of chromosomes in the germinal vesicle of sharks 



158. Nucleated and enucleated fragments of 3"()'/o«^'r//m 



159. Regeneration in Stenior ...... 



160. Nucleated and enucleated fragments of .-/wa/^rt . 



161. Nucleated and enucleated fragments of plant-protoplasm 



162. Position of nuclei in plant-cells . 



163. Ovary of Forftcula .... 



164. Normal and dwarf larvre of sea-urchins 



165. Supernumerary centrosome in Ascaris 



166. Cleavage of dispermic egg of Toxopneusles 



167. Centrosomes and cilia ... . 



339 



342 

 343 

 344 

 345 

 347 

 349 

 352 

 355 

 356 

 357 



