FEEDING OF CREPIDULA. 



447 



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Fig. 1. — Ventral view of Crepidula. The arrows indicate the direction of the food-current. 



(Drawn from life, x 2. ) 



A. Food-pouch for the coarse food -particles : the main part of the pouch is hidden from 



view by the animal's "head." 



B. Cylindrical mass of food in the food-groove ; seen through the translucent body-wall. 



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Fig. 2. — Ventral view of Crepidula with a part of the "neck" region supposed to be cut 

 away to show the gill lying over the back of the animal. 



A. Food-pouch. 



B. The pointpr points at the exposed tips of a few gill-filaments, just in front of which 



can be seen the food-groove in section. 

 The little arrow between the cut surfaces of the animal indicates the direction 

 in which the fine food-particles travel. 



Most of the fine particles of suspended matter are carried by the 

 current against the gills, and being caught by the cilia of the gill- 

 filaments or in the mucus secreted by the gill, are hurried along 



