1SOPODA. 



289 



Fig x>55 Section of the embryo pill-bug, d, intestine; I, epithelium form- 

 ing the walls of the two lobes of the liver ; g, transverse section of the nervous cord ; 

 h, walls of the body. After Bobretzky. 



Fi; 256. Section of more advanced embryo pill-bug, h, heart ; hp, hypoder- 

 mal layer oi> body-walls ; m, muscular wall of the intestine : , epithelial lining of the 

 intestine ; p, dividing cell-wall between the heart and intestine ; /, two lobes of the 

 liver ; g, ganglion, the clear space being filled with the fine granular substance of the 

 eanglion. After Bobretzky. 



Fi?. 257.Bopyrvs. A, ventral. B, dorsal side of the female : O, lateral and D, 

 <lorsal view ot the male ; e l , head and first thoracic segment ; c 2 , antennae all en- 

 larsed. Packard, del. 



