1SOPODA. 



309 



FIG. 261. 



FIG. 262. 



Fig. 260. 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<r. 261. Section of more advanced embryo pill-bug, h, heart ; /<;>, hypoder- 

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

 intestine; ;>, 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. 



Fig. %SIH.Bopyrus. A, ventral, B, dorsal side of the female:^ C, lateral and D, 



dorsal view ot the male 

 larged. Packard, del. 



c 1 , head and first thoracic segment ; c a , antennae all en- 



