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

 artery; ab, abdomen; an, anus; b. d, bile duct; bf. 4, cheliped; bnt, ventral 

 nerve-cord; cs, cardiac division of stomach; ctk, cephalo-thorax; em, dorsal 

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

 jwaf, small intestine; 0, ostium; oa, ophthalmic artery ; oaa, superior abdominal 

 artery; ce, gullet; //. /-J", pleopods; //. 6, uropod; J>s, 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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