LIST OF PLATES. 



Plate 1. (Frontinpiece). Development of the face in Mammals 

 (Man. Bat, Cat, Sheep) in three different stages 



Explanation vol. ii. 34C 



Plate II. (between p. 240 and p. 241). Total egg-cleavage. Gas- 

 trulation of holoblastic eggs (primordial and unequal cleavage) 



Explanation 240 



Plate III. (between p. 240 and p. 241). Partial egg-cleavage. 

 Gastrulation of meroblastic eggs (discoidal and superficial 

 cleavage) ... ... ... ... Explanation 240 



Plate IV. (between p. 320 and p. 321 ). Diagrammatic transverse 

 section through various ontogenetic and phylogenetic stages 

 in the development of the human body, showing the formation 

 of this from the four secondary germ-layers ... Explanation 321 



Plates V. (between p. 320 and p. 321). Diagrammatic longitu- 

 dinal sections through various germ and tribal forms of Man, 

 showing their formation from the four secondary germ-layers 



Explanation 323 



Plate VI. (between p. 362 and p. 363). Comparison of the 

 embryos of a Fish, an Amphibian, a Reptile, and a Bird, in 

 three different stages of evolution ... ... Explanation 362 



Plate VII. (between p. 362 and p. 363). Comparison of the 

 embryos of four different Mammals (Pig, Ox, Rabbit, and 

 Man) in three different stages of evolution ... Explanation 362 



Plate VIII. (between p. 404 and p. 405). Representation of two 

 human embryos, the one of nine, the other of twelve weeks : 

 the latter within the egg-membranes ... Explanation 405 



Plate IX. (between p. 404 and p. 405). Representation of a 

 human embryo of five months, natural size, within the egg- 

 membranes ... ... ... ... Explanation 405 



Plate X. (between p. 438 and p. 439). Germ-history of Ascidian 

 and Amphioxus ... ... ... ... Explanation 436 



Plate XI. (between p. 438 and p. 439). Structure of the body 

 of Ascidian, Amphioxus, and larva of Petromyzon 



Explanation 437 



