136 bloomer: on the uritish species of the genus sol: 



EN. 



EXPLANATION OF PLATE X. 



Solen pelluridus, Penn. 



Fig. r. View from the right side, alimentary canal, &c. x 3. 



Fig. 2. Longitudinal section of the stomach, showing the internal structure 



of the left side, x 12. 

 Fig. 3. Longitudidal section of the stomach, showing the internal structure 



of the right side, x 12. 



Refkrence Letters. 



Muscular ridge separating the 

 oesophagael from the car- 

 diac portion of the stomach. 



Muscular ridge separating the 

 small cavity receiving small 

 bile duct from pyloric 

 portion. 



Oesophagus. 



Oesophagael portion of stomach. 

 Posterior adductor muscle. 

 Posterior lip. 

 ,P.R.A.' Bifurcated parts of re- 

 tractor pedis anterior. 



Bifurcation of retractor pedis 

 posterior. 



Pyloric portion of stomach. 



Kectum. 



Stomach. 



Ventricle. 



