'Via 13. — Astacvs flnrciafilii. —The alimentary canal and livers seen from 

 above (nat. size), bd, bile-duct ; c«, caecum ; cs, cardiac portion of 

 stomach, the line pointing to the cardiac ossicle ; h(i, hind-gut ; mg, 

 mid-gut ; pe, pterooardiac ossicle ; ps, pyloric portion of stomach, 

 the line pointing to the pyloric ossicle ; r, ridge separating mid-glit 

 from hind-gut ; zc, zygocardiac ossicle. 



