ISOPODA. 289 
Fig. 256. 
Fie. 257. 
Fig. 255.—Section of the embryo pill-bug. d, intestine; 7, 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. : 
Fig, 256.—Section of more advanced embryo pill-bug. 2, heart; hp, hypoder- 
mal layer or body-walls ; m, muscular wall of the intestine ; ¢, epithelial lining of the 
intestine; p, dividing cell-wall between the heart and intestine; 7, two lobes of the 
liver; g, ganglion, the clear space being filled with the fine granular substance of the 
ganglion.—After Bobretzky. . 
Fig, 257.—. rus. A, ventral, B, dorsal side of the female; C, lateral and D, 
dorsal view ot the male; c!, head and first thoracic segment ; c?, antennez—all en- 
larged.—Packard, del. 
