DESCRIPTION OF PLATE XI. 135 



*, The sheath. 



e, The egg. 



/, The pellucid zone, around the embryo. 



g, The nucleus, having a constant semi -rotatory motion. 



h, h, Part of the body of the parent animalcule. 



This egg was watched by Mr. Lee till it burst, and the young was 

 excluded into the sheath of the parent ; from whence, in four hours, it 

 escaped, from the upper part of the case ; p. 68. 



