a.v. 



.1/. ^ — > - 



,-»r.v. 



//.ci7..^ -^^^ 'a^IN. 



l.cil 



il.j.-- 



Fig. 392. The ctenidia of the LameHibranchiata. A and B, Mytilus. C, 

 Anodonta. A, Vertical transverse section through ctenidium of one side. 

 av afferent vein; a.l ascending, d.l. descending limb of filament; cil.d. 

 ciliated discs ; e.v. efferent vein ; F. foot ; il.s. interlamellar space ; il.j. mter- 

 lamellar concrescence ; ma. mantle ; muc. mucus travelhng ventrally (m direc- 

 tion of arrows) and muc.' collected in the food groove; pl.c plicate canals; 

 r V renal veins. B, Horizontal section through two adjacent filaments, bl.c. 

 blood ceWs; ch. chitinous rods; cil.j. ciliary junction; f.cil., fi.cil., /.a/ frontal, 

 latero-frontal, lateral cilia. The arrows denote the direction of the food 

 current and the path of the food particles it contains. C, Horizontal section 

 through a gill. Lettering as above. 



