IN THE UNITED KINGDOM AND FRANCE. 



9 



clature of the months ; in truth, however, the development of 

 spermatozoa (see a) takes place generally in the month of April. 

 In two or three weeks these disappear, and the ovaries become 

 full of a creamy matter, causing the appearance commonly known 

 as milchyness. 



Under a powerful microscope this is resolved into oval clusters 

 of globular atoms (b, c) floating in a transparent liquid, but with- 

 out any apparent enclosing outline or membrane, a little later 



Fig. 1. 



G.W.H. 



a. Spermatozoa. 6. Milch, early stage. c. Milch, more advanced 



Fig. 2. — Oyster Spat in various stages. 



d. White Spat, without shell. 



/. Black Spat, shell perfect. 



G.W.H. 



e. White Spat, more advanced 

 g. Spat just attached. 



