THE EMBRYOLOGY OF THE HONEY BEE 203 



C , bl Mint 



DLMcl- 



OMcl.-— 



TraTr.— 



VLMcl'-— " 



Fig. 82. Transverse section through the third trunk segment of an 

 embryo, Stage XIII-XIV, x 387. 



cardioblasts (Cbl) however are still some distance laterad of this 

 point, but have lost their connection with the rudiment of the 

 enteric muscles, which now uniformly cover the lateral surface 

 of the mid-intestine {Mint). Above the dorsal diaphragm and 

 laterad of the cardioblasts are two small cells evidently not 

 muscle cells; these are fat cells belonging to the third section of 

 the fat body (3F) or pericardial fat cells. These are derived from 

 the dorsal margin of the somatic layer of the mesoderm. The 

 other tissues and organs derived from the mesoderm have vir- 

 tually attained their final form, and may be recognized without 

 difficulty. 



