302 



J. H. ORTON. 



f? 



g 



f - - _ 



EN. 



CgT 



fch. 



-vm. 



Fig. 10. — View of the mantle cavity and gill of Creiiidula, showing the endostyle at the 



base of the gill. (The animal has been taken out of its shell and the mantle turned 



over to the left.) 



The dotted arrows on the endostyle. En, indicate the directions in which 



mucus is lashed from the endostyle on to the base of the gill-filaments. 



EN. Endostyle from which mucus and food-particles are lashed on to the 

 gill-filaments. 



c.gr. Ciliated groove along the left side of the endostyle carrying mucus for- 

 wards to the food -pouch, as indicated by the complete arrows. 



f.p. Food-pouch in which the heavier food-particles become lodged. 



f.ch. Food-channel on the right side of the body extending along the visceral 

 mass and the " neck " region of the animal towards the mouth. In 

 this channel is collected the main mass of collected food-particles 

 which are carried in the direction indicated by the arrows. 



f. Foot. 



v.m. Visceral mass, 



g.f. Gill-filaments. 



