Fig. 5. — Antaeus fluviatilis. — 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.; amm, 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 •, seta, superior abdominal artery ; t, testis ; vd, vas 

 deferens. 



