CoE. — Nemerteans. 



PLATE 19. 



Amphiporus gelatinosus Coe. 



Fig. 119. Transverse section of liead in brain region, sliowing the relatively 

 small size of brain, rhynchodaeum (r/i), esophagus, and blood ves- 

 sels as compared with the enormous mass of parenchyma {jxir) 

 between these organs and the body walls. The brain is cut 

 through the ventral commissure. The ocelli lie in or directly 

 beneath the muscular layers of the body walls, and are therefore 

 widely removed from the brain. X iO. 



Fig. 120. Portion of transverse section of body near middle of esophageal 

 region, showing the relatively small size of proboscis sheath, 

 stomach, and other organs as compared with the great mass of 

 parenchyma whicli occupies the major portion of the space 

 enclosed by the body walls. On the right side of the stomach is 

 seen the small intestinal caecum (ic), and above the lateral nerve 

 the branches of the nephridial system {nep) with the efferent 

 duct- {nd) opening to the exterior above the lateral nerve — a 

 condition rare among the Hoplonemertea. X 31. 



