xxii ILLUSTRATIONS 



137. Diagram of the alternating sexual and asexual reproduction 



in the life cycle of Ehiieria schuhergi 574 



138. Dia.gra.m of the life cycle of Plasmodium vwax 577 



139. Diagram of the life cycle of Payau/eci/^m caudatum . . . 579 



140. Copromonas subtilis in hologamous copulation 585 



14 1. Autogamy in Sappinia diploklea 596 



142. Actinophrys sol in autogamous fertilization 599 



143. Progamic divisions in Monocystis rostrata 601 



144. Isogamous gamete formation and fertilization in Ophryo- 



cyst'is mesnili 603 



145. Diagram of the life cycle of Sphaeromyxa sdbrazesi . . . 607 



146. A ipa.ir of Euplotes patella in conjugSLt'ion 619 



147. Diagram of ciliate conjugation 625 



148. Stages in the first maturation division of Euplotes patella . 628 



149. First maturation spindles of Uroleptus mohilis 630 



150. Second meiotic division in Euplotes patella 632 



151. Third maturation division and the fertilization nucleus in 



Euplotes patella 633 



152. Migration of the pronuclei across the protoplasmic bridge 



of conjugating Chilodonella unc'matus 635 



153. Stages in the progress of the reorganization bands through 



the macronucleus of Aspidisca 646 



154. Macronuclear dissolution in Blepharisma undulans . . . 647 



155. General plan of the usual nuclear changes during endomixis 



in Parameciujn auvelia 648 



156. Possible methods of micronuclear and cell division at the cli- 



max of endomixis in Paramecium aurelia 649 



157. Diagram of the normal process of endomixis in Trkhodina 



sp 651 



158. Endomixis in Paramecium multimicronucleatum .... 652 



159. Endomixis in Paraclevelandia simplex 653 



160. Nuclear changes during autogamy in Paramecium aurelia . 655 



161. Hemixis in Paramecium aurelia 656 



162. Clim20!L of endomixis in Paramecium aurelia 657 



163. Axxtogdimy in sewetA tdiCes of Paramecium aurelia . . . . 658 



164. Graph of division rate of Parameciujn aurelia 660 



