180P0DA. 



389 



Fig. 855. 



IDT 



Fig. 257. 



Pig. 855 — Section of the embryo pill.bng. d, intestine; L 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. 



Fiir. 356.— Section of more advanced embryo pill-bug. A, heart ; hp, hypoder- 

 mal layer or body-walls ; m, muscular wall of the intestine ; e, epithelial lining of the 

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

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

 ganglion.— After Bobretzky. 



Fier. 257. — B&pyrus. A, ventral, B, dorsal side of the female ; C, lateral and D, 

 dorsal view ot the male ; c', head and first thoracic segment ; c", antennse- all en. 

 largod. — Packard, del. 



