( 70 ) 

 TABLE XVII. 



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

 cestral Line, compared with the five earliest stages of Individual and 

 of Systematic Evolution. 



Form-Value 



Of the five earliest 

 Btages of the animal 

 body. 



First Stage. 

 A quite simple cytod 

 (a non-nucleated plas- 

 tid). 



2. 



Second Stage. 

 A simple cell (» 

 nucleated plastid). 



Third Stage. 

 A quite simple ag- 

 gregation of simple, 

 similar cellg. 



Fourth Stage. 

 A simple hollow globe, 

 filled with liquid, (he 

 wall of which consists 

 of a single stratum of 

 homogeneous cells. 



Ftfth 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 in the evolu- 

 tion of the tribe. 



1. 



Monera. 



The oldest animal 

 Monera (originating 

 by spontaneous gene- 

 ration). 



2. 



Amoeba. 



Oldest animal Amoeba, 



Synamoeba. 



The oldest aggrega- 

 tion of animal Amoebae. 



4: 



Planaea. 

 An animal hollow 

 globe, the wall of 

 which consists of a 

 single stratum of 

 ciliated cells. 



(plastcea.) 



5. 



Gastraea. 



Parent-form of in- 

 testinal animals, or 

 Mtazoa. 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 germ. 



Monerula. 



A non - nucleated 

 animal-egg (after fer- 

 tilization and alter j Monera. 

 loss of the germ- 

 vesicle). 



The System. 

 The five earliest 

 stages in the animal 

 system. 



1. 



Monera. 



Protamceba, Bathy- 

 bius, and other extant 



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 stratum 

 of homogeneous cells 

 (the Planula of lower 

 animals). 



(jblastosphcera.) 



5. 



Gastrula. 



Intestinal larva. 



A simple intestinal 

 cavity with a mouth- 

 opening. The body- 

 wall is formed by the 

 two primary germ- 

 layers. 



2. 



Amoeba. 



Extant Amoeba. 



3. 



Labyrinthula. 



A mass of similar, 

 one - celled primitive 

 animals. 



Magosphaera. 



A hollow globe, the 

 wall of which consists 

 of a single stratum oi 

 homogeneous ciliated 

 cells. 



5. 



Haliphysema. 



A quite simple plant- 

 animal. An unarticu- 

 lated uniaxial person, 

 the body-wall of which 

 consists of the exodernt 

 and the entoderm. 



