NEMERTEA 



117 



generative cells arise, and certain spaces found in one or two 

 species between the diverticula of the alimentary canal. The 

 morphological value of these spaces is still under discussion. 

 They do not contain a corpusculated fluid. 



The mouth is situated on the ventral side, and is sur- 



I II 



Pig. 77. — Diagram of the organs of a Nemertine. I. from below. II. from above. 



After Hubrecht. 



1. Mouth. 



2. Intestinal diverticula. 



3. Anus. 



4. Ovaries. 



5. Nephridia. 



6. Brain lobes. 



7. Longitudinal nerves. 



8. Proboscis. 



9. Proboscis sheath. 

 10. Proboscis pore. 



rounded by swollen lips, it leads into a muscular oesophagus 

 which soon opens into a spacious stomach. The stomach has 

 a wide lumen, and it occupies a large part of the animal ; it 



