ANATOMY OF A MACTRA. 



Fig. 88. ANATOMY OF A MACTRA. 



Explanation of Fig. 88. Anatomy of a mactra ; one valve of the shell, 

 the corresponding half of the mantle and the branchiae have been removed 

 on the left side : c. the shell ; m. the mantle ; ma. the anterior muscle ; 

 mp. the posterior muscle; b. the mouth; t. the tentacle; e. the sto. 

 mach; c*. appendix of the stomach; i. the intestines;/, the liver; p. 

 the foot ; co. the heart traversed by the rectum (r) ; ts. the superior tubs 

 into which the anus (a) opens ; ti. the inferior or respiratory tube ; Ir. the 

 branchiae of the right side ; ga. the anterior ganglia ; no. nerves arising 1 

 from them; ng. inter-ganglionic nerves; gp. poster'scr ganglia; ~np 

 nerves arising from th em and distributed to the mantje, 



