Fig. 13. — Astacus flnviaf\ll<i.—ThQ alimentary canal and livers seen from 

 above (nat. size), hd, bile-duct ; cce, csecum ; cs, cardiac portion of 

 stomach, the line pointing to the cardiac ossicle ; hg, hind- gut ; mg, 

 mid-gut ; 2JC, pterocardiac ossicle ; ps, pyloric portion of stomach, 

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

 from hind-gut ; zc, zygocardiac ossicle. 



