NBMERTEA ENOPLA 



637 



oesophagus that does not reach the bram ; on the other hand 

 it differs greatly from that in both groups, as the different 

 parts of the stomodaeum, that as a rule gradually pass into 

 each other (Text-fig. 6), are sharply separated. The narrow 



Text-fig. 9. 

 t, rlvynck. cUv. ^^ 



r/iynch. cUv. 



'"/vyach 



Section through Siboganemertes weberi, n. gen. n. sp. 

 Text-fig. 10. 



rliyncJi. \r 



rh\ vich 

 'diu 



Section through Drepanophorus albolineatus after B ii r g e r 

 (6, PI. xvii, fig. 10). 



pylorus opens by a hole in the wall of the gastric cavity ; 

 oesophagus and gastric cavity communicate by a narrow 

 opening (Text-fig. 11). It seems evident that, though the 

 presence of rhynchocoelomic diverticula, cerebral organs, and 

 metamerically placed genital organs might suggest the enclo- 

 sure of Siboganemertes weberi in the Eeptantia, the 



