INDEX OF SUBJECTS 
All numbers refer to pages. 
Words in italics are names of families, 
genera, species, or of higher divisions. 
Numbers in thick type are num- 
bers of pages on which there are figures. 
Aborting spindle, 157. 
Accessory chromosome, 134, 202. 
Acidophile, 11. 
Actinospherium, 222. 
Ageniaspis, 146. 
Allelomorph, 309. 
Alternation of generations, 23. 
Alveolar structure of protoplasm, 
4. 
Ameebocyte, 71, 73, 79. 
Amia, 32, 33. 
Amitosis, 13-14, 133-139, 250. 
Amphiaster, 15. 
Amphibia, amitosis, 134-135; her- 
maphroditism, 205 ff. 
Amphimixis, 309. 
Amphiuma, 135. 
Amyloplastid, 7. 
Anaphase, 15, 16. 
Anello cromatico, 121, 123, 223. 
Animal pole, 20. 
Aptera, life cycle, 22. 
Arcella, 26. 
Archeocyte, 70-73. 
Archoplasm, 5, 7. 
Arenicola, 188. 
Armadillo, polyembryony in, 161. 
Arphia, 307. 
Arthropoda, 212. 
Ascaris, 122, 174 ff., 217 ff., 230, 
241, 301; maturation in, 261, 
263; mitochondria in, 284. 
Asexual larve, 149. 
Asplanchna, 186, 225. 
Aster, 15. 
Asterias, 6. 
Attraction-sphere, 5, 7, 227. 
Aurelia, 183. 
Aussenkoérnchen, 164, 213, 216, 228. 
Azolotl, 159, 208. 
Bacteria, 4, 186-187. 
Basophile, 11. 
Bat, 188. 
Besondere Korper, 180, 181 f., 
213, 228, 239. 
Bidder’s organ, 207. 
Binary fission, 17. 
Binuclearity hypothesis, 27. 
Bioblast, 276. 
Bivalent chromosomes, 44. 
Blastotomy, 161. 
Bryozoa, 161. 
Budding, 17, 22, 23, 69, 161, 297. 
Calligrapha, 109, 111, 230. 
Calliphora, 107, 111 f., 235. 
Camponotus, 221. 
Canthocamptus, 165. 
Cat, 187. 
Cell, 2-16; definition, 3; division, 
13-16; lineage, 29; shape, 4; 
size, 4; theory, 3. 
Centrifuged eggs, 178. 
Centrosome, 5, 7, 14, 15, 164, 169, 
237, 238. 
Cerebratulus, 232. 
Cestoda, 136-137. 
341 
