16. 



tion, did this organ seem to be fvmctiorLal. The youngest speci- 

 men collected with a dredge shows a small pouch, lined with 

 epithelium, which opens into the posterior end of the groove that 

 separates the rauscvilar flaps of the foot. The gland receives a 

 rather large nerve from each pedal ganglion, and often contains a 

 few fine threads. These thjreads have never been seen protruding 

 from the -gis^tds duct. 



.t^jlMMTASX CANAL. 

 Figures 4 and 5. 



The rather broad and long oesophagus opens into the 

 dorsal end of a capacoous stomach, figure 4, sto . which extends 

 from near the dorsal margin of the animal, well Into the foot. 

 The stomach is divided transversely by a well marked constriction, 

 and internally by a prominent ridge, formed by elongated epithe- 

 lial cells. Above this ridge the epithelial cells are rather 

 slender, carry cilia, as do the other epithelial cells of the ali- 

 mentary canal, stain deeply, and have the appearance of secretory 

 cells. Bel077- the ridge the epithelial cells are broader and 

 stain less deeply. 



Prom the ventral end of this portion of the stomacli, 

 the intestine bends back along its posterior side, ascends to a 



