96 NERVOUS SYSTEM. 



the elastic ligament of the hinge ; b, c, the two adductor 

 muscles ; D, the double tube or syphon ; e, the mantle ; 

 F, the branchise ; g, the foot. 



With respect to the nervous system of the bivalve 

 moUusks, it consists of small ganglia, or knots ; one of 

 which is placed near the mouth, another in the vicinity 

 of the syphon, and others near the adductor muscles ; 

 from these arise minute nervous filaments variously 

 distributed. 



