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GILMAN A. DREW. 



between the palps, where the cilia carry it to the mouth. 

 Very few specimens have shells that are transparent enough 

 to allow observation of processes carried on inside of the 

 shell, but there can be no doubt as to the path taken by the 

 mud after it has started up the grooves in the palp appen- 

 dages. 



Feeding is much more easily observed in the case of 

 Yoldia limatula. In this species the animal has fre- 



Text-fig. T. — An adult specimen of Yoldia limatula as it appears while 

 feeding. e$. Exhalant siphon, is. Inhalant siphon, pap. Palp appen- 

 dages, si. Siphonal tentacle. 



quently as much as one third of the posterior end of the shell 

 above the mud while feeding (Text-fig. T). The palp appen- 

 dages are protruded, and one at least bends over and inserts 

 its tip in the mud. By the action of the cilia in the longi- 

 tudinal groove, large quantities of mud and food are elevated. 

 There is no reason to suppose that the palp appendages of 



