Figure 14
From: Development to metamorphosis of the nemertean pilidium larva
Relative position of the juvenile foregut rudiments in the pilidial digestive tract. The lower drawing represents the pilidial digestive tract as if it were straightened along the path of a hypothetical food particle (pink line in each), which passes: 1 - larval ciliated band, 2 - larval esophagus, 3 - esophageal pouches (paired rudiments of the juvenile foregut), 4 - ciliated ridges in the larval esophagus, 5 - stomach.