Fig. 125. — Astacus fluviatilis, dissection from the right side, aa, antennary 

 artery; ab, abdomen; a?z, anus; b. d, bile duct; bf. 4, cheliped; bm, ventral 

 nerve-cord; cs s cardiac division of stomach; cik, cephalo-thorax : em, dorsal 

 muscles; fm t ventral mucles; g, brain; h, heart; Ad, large intestine; lr, liver; 

 ■md, small intestine; o, ostium; oa, ophthalmic artery; aaa, superior abdominal 

 artery; te, gullet r PI. 1-5, pleopods; pi. b, uropod; ps, pyloric division of 

 stomach; sa, sternal artery; £, testis and telson; uaa, inferior abdominal artery ; 

 vd, vas deferens; vdo, male genital aperture. (From Lang after Huxley.) 

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