1SOPODA. 



289 



FIG. 257. 



Pig 255. Section of the embryo pill-hug, d, intestine; ?, epithelium form- 

 in? the walls of th- two lobes of the liver ; ff, transverse section of the nervous cord ; 

 h, walls of the body. After Bobretzky. 



FiL'. 256. Section of more advanced emhryo pill-bus, h, heart ; /i/i, hypoder- 

 nial 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 ; c/, ganglion, the clear space being filled with the fine granular substance of the 

 ganglion. After Bobretzky. 



FIST. 257,Bopyrus. A, ventral, B, dorsal side of the female: (\ lateral and D, 

 dorsal view ol the male ; c 1 , head and first thoracic segment ; c 2 , autunnie -all en- 

 . Packard, del. 



