Fig. 3. X-ray photographs of the digestive tract of Nautilus pompilius. Distribution of barium-sulphate-labelled food (A) 20 min, (B) 40 min, (C) 2 h, (D) 3 h, (E) 4 h, (F) 6 h, (G) 8 h, (H) 9 h and (I) 11 h after food intake. At each time point, a lateral (left) and topview (right) image are shown. Shell length 11 cm. CR, crop; J, jaw; M, midgut; R, rectum; RA, renal appendages; S, stomach; SE, septum.