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

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

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

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

 md, small intestine; a, ostium; oa, ophthalmic artery ; oaa, superior abdominal 

 artery; ae, gullet; //. /-j, pleoppds; //. 6, uropod; ps, pyloric division of 

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

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

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