1SOPODA. 



289 



FIG. 257. 



Fig 255. Section of the embryo pill-bug. <l, intestine ; I, epithelium form- 

 Ing the walls of th^ two lobes of the liver ; g, transverse section of the nervous cord : 

 h, walls of the body. After Bobretzky. 



Fisr. 2*16. Section of more advanced embryo pill-bug, ft, heart ; hp, hypoder- 

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

 intestine; />, dividing cell-wall between the henrc and intestine; I, two lobes of the 

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

 ganglion. After Bobretzky. 



Fi<*. 257.Bopyrug. A, ventral, B, dorsal side of the female: C, lateral and D, 

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

 larsed. Packard, del. 



