264 



MOLLUSC A, 



flap can be reflected over to the left and the true dorsa 

 surface of the body or diaphragm exposed. The pulmonar 

 chamber is then seen to be triangular in shape, bounded b; 

 the collar in front, the vascular mantle above and thi 

 diaphragm below. xMong its outer ^g^^ emerging at th( 



Fig. 185. — First Dissection of Snail {LLelix pomatia). 

 (Ad nat.) t 



Ocular Tentacle, 



Ureter, 



Auricle of 



Heart.' 



The snail is pinned out on its ventral surface, and the mantle is cut free frDui th 

 body by a cut along the collar and round the spiral. Note the pulmonary vein;, ii 

 the mantle leading to the auricle of the heart, which passes to the ventricle and hcnc 

 by an aorta to the body. 



* The excretory port is really within the pulmonary aperture. 



