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TABLE XYII. 



Systematic Survey of the five earliest evolutionary stages of the Human An- 

 cestral Line, compared with the five eai'liest stages of Individual and 

 of Systematic Evolution. 



Form-Value 

 Of the five earliest 

 stages of the animal 

 body. 



1. 



First Stage. 

 A quite simple cytod 

 (a non-nucleated plas- 

 tid). 



2. 

 Second Stage. 

 A simple cell (a 

 nucleated plastid). 



3. 



Third Stage. 

 A quite simple ag- 

 gregation of simple, 

 similar cells. 



Fourth Stage. 

 A simple hollow globs, 

 filled with liquid, the 

 wall of which consists 

 of a single stratum of 

 homogeneous cells. 



5. 



Fifth Stage. 

 A hollow body, with 

 a single axis, the wall 

 of which consists of 

 •different cell-strata ; 

 with an opening at one 

 pole of the axis. 



Phylogeny. 

 The five earliest 

 stages iu the evolu- 

 tion of the tribe. 



1. 



Monera, 



The oldest animal 

 Monera (originating 

 by spontaneous gene- 

 ration). 



2. 

 Amoeba, 



Oldest animal Amoeb£\, 



3. 

 Synamoeba, 



The oldest aggrega- 

 tion of animal Amoebae. 



4. 

 Flansea. 



An animal hollow 

 globe, the wall of 

 which consists of a 

 single stratum of 

 ciliated cells, 

 (ptastoia.) 



5. 

 Gastrsea, 



Parent-form of in- 

 testinal animals, or 

 Mctazoa. Simple pri- 

 mitive intestine with 

 primitive mouth. The 

 body-wall is formed 

 by the exoderm and 

 the entoderm. 



Ontogeny. 

 The five earliest 

 stages in the evolu- 

 tion of the ^erm. 



1. 

 Mouenda. 



A non - nucleated 

 animal-egg (after fer- 

 tilization and alter 

 loss of the germ- 

 vesicle). 



2. 

 Cytula. 

 A nucleated, ferti- 

 lized animal-egg (" first 

 cleavage globule "), 



3. 

 Morula. 



" Mulberry-germ." 

 A globular mass of 

 cleavage -cells. 



4. 

 Blastula. 



A hollow globe, the 

 wall of which consists 

 of a single stralum 

 of homogeneous cells 

 (the Planula of lower 

 animals). 



(blastosphcera.) 



5. 

 Gastrula. 



Intestinal lai'va. 



A simple intestinal 

 cavity with a mouth- 

 opening. The body- 

 wall is formed by the 

 two primary germ- 

 layers. 



The System. 

 The five earliest 

 stages in the animal 

 system. 



1. 

 Monera. 



Protamo3ba, Bathy- 

 bius, and other extant 

 Monera. 



2. 

 Amceba. 



Extant Amoeba. 



Labyrinthula. 



A mass of similar, 

 one - celled primitive 



4. 

 Magosphaera. 



A boUow globe, the 

 wall of which consists 

 of a single stratum of 

 homogeneous ciliated 

 cells. 



Haliphysema. 



A quite simple plant- 

 animal. An unarticu- 

 lated uniaxial person, 

 the body-wall of which 

 consists of the exoderm 

 and the entoderm. 



