19. 



along this space, v&ien the appendage is being extended. Other 

 blood spaces occ-ar in the connective tiss^ae of the appendage, but 

 they are much smaller and anastomose freely. 



The epitheliiim lining the groove formed by the longi- 

 tudinal folding of the appendage, is densely covered with cilia. 



Ihe an.irial while feeding, figure 10, is sliglitly tipped 

 ventral ly from the perpendicular, and frequently has about one 

 third of its posterior end above the mud. IThile in this posi- 

 tion, the palp-appendages are thirust out of the shell and one, at 

 least-, bends over and inserts its tip in the mud. The cilia lin- 

 ing its longitudinal groove immediately begin to elevate the 

 mud, "vSiich is rich in living organisms. The streaan of particles 

 passing along the groove is large enough to be distinguished at a 

 distance of some feet. In this way, foraminifers, ostracods, 

 and even small lamellibranchs, and gastropods, together with the 

 smaller forms and mud, are passed along the groove, finally be- 

 tween the palps, and so on into the mouth. Thus vie find that 



( 11 1 

 Mits"akuri's surmise^ ' , based on finding sand in the grooves 



of the palp-appendages of preserved specimens, was riglit. The 



palp appendages are food collectors. 



