•2fi 



(h) A coil on the dorsal surface of the visceral mass 

 Avithiu the stomach coil (fig. 10, ////. 2). The anterior 

 limb of this coil communicates with the end of a, and the 

 posterior limb with the posterior limb of c. 



{c) A small coil ventral to {a) (fig. 10, Int. o). Its 

 anterior limb passes, at the right anterior corner of the 

 visceral mass, into 



(d) a long coil (lig. 10, Int. 4) which hrst passes, over 

 the right anterior corner of the visceral mass and then 

 proceeds beneath the pericardium and around the 

 external border of the stomacli to about the middle of 

 the right side, when it turns back and foims 



[e] the last coil (fig. 10, Int. 5), which is in close 

 contact with [d) until it reaches the pericardium, when it 

 l)roceeds along the posterior edge (jf this to the animal's 

 right shoulder and opens on the anal papilla. The last 

 part of this coil {c) is the rectum. Its ventro-lateral wall 

 has two inwardly projecting ridges with a gutter between 

 them. The anus opens at the tip of the anal papilla 

 which projects into the nuchal cavity on tlie right 

 shoulder (fig, 4). The walls of this projection are mu.ch 

 thickened, and its lining is papillated. The ventro- 

 lateral ridges of the rectal wall become more strongly 

 marked as the walls thicken towards the anus (fig. 21). 

 Judging from the condition in other Gastropods it would 

 seem probable that the rectum once ran forward in or 

 near the median plane traversing the pericardium. The 

 shifting of the anus to the right side, and of the peri- 

 cardium to the left, has made the rectum lie across the 

 body, and has pulled out the wiiole of the last coil of the 

 gut so that it now lies on the extreme outside of the 

 hump around the left side of the latter. 



II. The Larue Glands of the Gut. — The Buccal 

 Glands (figs. (), 15, 10) are four compound orange- 



