538 KICHARD EVANS. 



Fig. 53. — This figure represents a section across the uterus in the neigli- 

 bourhood of one of tlie embryos contained in it. Note that on one side the 

 lining cells are columnar, while on tlie other side they are becoming flattened ; 

 that is, there is a gradual transition from the tall and columnar condition to 

 the flattened one. There is no destruction or loss of cells in any way. 



Fig. 54. — This figure represents a transverse section of one of the uteri of 

 Eoperipatus Weldoni. The section is from close to the posterior end, 

 and should be compared with the representation of the uterine walls of Eo- 

 peripatus Horsti shown in Fig. 33. 



