TABLE XXII. 



Systematic Survey of the Periods in the Tiubal History of the 



Human Eace. 

 (Compare Table VIII., vol. i. p. 402.) 



FIRST MAIN PERIOD IN TRIBAL HISTORY. 



The Plastid Ancestors of Man. 



The form of the ancestors of man is equal to the simple individual of the 

 first order, a single plastid. 



First Stage : Moneron Series (Fig. 163, p. 46). 

 The ancestors of man are single, living, simple cytods. 



Second Stage : Amoeba Series (Fig. 167 p. 53). 

 The ancestors of man are single, living, simple cells. 



SECOND MAIN PERIOD IN TRIBAL HISTORY. 

 The many-celled Primitive Animal Ancestors of Man. 



The ancestors of man consist of a closely -united society of many homo- 

 geneous cells ; hence their form-value is that of individuals of the second 

 order, of Idorgana. 



Third Stage : Synamoeba Series (Fig. 170, p. 55). 



The ancestors of man are many-celled primitive animals of the simplest 

 kind : solid masses of simple, homogeneous cells. 



Fourth Stage : Planaea Series (Figs. 172, 173, p. 60). 



The ancestors of man are many-celled primitive animals of a character 

 like that of the Magosphccra and certain planula-larvae, of equal rank with 

 the ontogenetic Blastula or Blastosphara ; hollow spheres, the wall of which 

 consists of a single stratum of ciliated cells. 



