Fig 72. A, transverse section through the lateral ectoderm of the 

 fourth trunk segment of an embryo, Stage X, showing the formation of 

 oenocytes (Oen). B, a similar section from the third trunk segment of 

 an embryo, Stage XI-XII. C, section through the lateral ectoderm of the 

 fourth trunk segment of an embryo, Stage XIII, showing the point where 

 the oenocytes arose. D, the same, from the sixth trunk segment of an 

 embryo, Stage XIII-XIV, x 600. 



