180P0DA. 



309 



Pig. 262. 



Fig. 260.— Section of the embryo pill.bng. d, intestine; I, epitlielium 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. 



Fill. 861 —Section of more udvanced embryo pill-bug. h, heart ; hp, hypnder- 

 mal layer or body-\\'ans ; m, muscular wail of the intestine : c, epithelial lining of the 

 intestine; p, dividing cell-wall between the hejirt and intestine; I, two lubes of the 

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

 ganglion.— After Bobretzky. 



" Fisr. iili2.—Bopyrus. A, ventral, B, dorsal side of the female ; O, lateral and D, 

 dorsal view ot the male ; c^, head and first thoracic segment ; c"^, antennae— all en- 

 larged.— Packard, del. 



