CRUSTACEA. 



Fig. 47. ANATOMY OF CRAB. 



Fig. 47. p, Part of the lining membrane of the shell. //, The heart. 

 a, Arteries. 6, liranchice in their natural position. l' t Branchiae turned back 

 to show their vessels. 5, Stomach. m, Muscles of stomach. I, Liver. 



Fig. 48. CIRCULATORY APPARATUS OF LOBSTKU. 



Fig. 48. It, Heart. g, g, Sinus or dilated vein receiving the blood which 

 comes from different parts of the body, and is thence sent to the branchiae />, 

 from which it returns to the heart by the branchial voins, v. 



