334 



ZOOLOGY 



JSECT. 



Digestive Organs. The moutli (mtJi) is a narrow crescentic 

 aperture situated in the middle of the lophophore, towards its 



.si 



FK;. 2ii(i. A. Body of Magrellania lenticularis, removed from shell; B, sagittal section 

 of the entire animal. Both semi-diagrammatic, the lophophore being represented as of smaller 

 proportional size than in the actual animal (cf. Fig. 207). >L <jl. digestive gland ; d. //i. dorsal 

 mantle-lobe ; </. v. dorsal valve of shell ; r/o/ii, (ton'*, gonads ; lit. heart ; int. intestine ; Ip, tyi. 

 lip; /^.lophophore; lpl,i, its coiled process; mth. mouth; nph. in B, nephridium, in A 

 nephridial aperture ; pd. peduncle ; jtl. xi. pallial sinuses ; . setae ; v. m. ventral lobe of 

 mantle ; r. c. ventral valve of shell. 



convex or ventral edge, and is bounded dorsally by the lip. It 

 leads into a V-shaped enteric canal which consists of a gullet, 



