<tfti/rtr 



eia 





Fig. 5. — Astaciis fluviatiUs. — A male specimen, with the roof of the 

 carapace and the terga of the abdominal somites removed to show 

 the viscera (nat. size) : — aa, antennary artery ; ag, anterior gastric 

 muscles ; amni, adductor muscles of the mandibles; cs, cardiac 

 portion of the stomach ; gg, green glands ; h, heart ; hg, hind gut, 

 or large intestine ; Lr, liver ; oa, ophthalmic artery ; -pg posterior 

 gastric muscles ; saa, superior abdominal artery ; f, testis ; vd, vas 

 deferens. 



