462 



J. F. ILLING WORTH, 



Fig. K. Arterial circulation of visceral cavity (dorsal view). Ao aortic enlarge- 

 ment, B.s buccal sinus, G.a gastric artery, G.Ao gastric aorta, Gen. .a genital arteiy, 

 Gen. Ao genital aorta, JT.a hepatic artery, In.a intestinal artery, L.p.a lateral pedal 

 artery, M mantle edge. Mo mouth, N. a neural arteries, P. a pedal ai'teries, Pal. a palliai 

 artery, Rad.t radula tube, V ventricle. 



the anterior branch on the right side of the body. Capillary branches 

 are given off from all parts of the palliai artery to the mantle. At 

 quite regular intervals of about two centimeters branches run up to 

 the muscles bordering the shell. In this way the shell muscles are 

 constantly supplied with arterial blood. In a median cross-section 

 of the animal (Fig. D Fol. a) the palliai artery is seen lying in the 

 tissue where the mantle joins the wall of the visceral cavity. On 

 the left side it is comparatively large, while on the right it is much 

 smaller and is difficult to see. 



