HEPTABRACHIA SUBTILIS 



343 



Fig. 139. Heptabrachia subtilis: Metasoma: A -part of the non-metameric section of the pre- 

 annular region from the ventral side ; В - cuticular plaques from the metameric region ; С - plaques 

 from the zone of thickened papillae ; D - zone of thickened papillae from the ventral side ; E - part 

 of the postannular region in ventral view. 

 p - plaques; pa - papillae; vv - ventral blood vessel seen by transparency. (After Ivanov, 1957a.) 



