3 (2) 



Mouth with pharynx simplex opening terminally at the posterior end of the body (Fig. 7) 



Family DIOPISTHOPORIDAE (p. 60) , 



Genus Diopisthoporus. 



Figure 7. — Diopisthoporus longitubus. 



3 (2) Mouth opening with or without a pharynx but not terminal at the posterior end of the body 



4 (i) Mouth with pharynx at the anterior end or very close to front end and with male pore at posterior end of 

 body (Fig. 8). Archiproporus minimus An der Lan has been placed in Proporus (Westblad 1945) but is now 

 considered to deserve ranking in a separate genus (Karling 1974:8); description of this species is unclear on 



some points and position of the genus seems to me uncertain (Fig. 9) 



Family PROPORIDAE (p. 58) 



Genus Proporus. 



Genus Archiproporus. 



Figure 8. — Proporus venenosus. 



®@~^^-^\3 



Figure 9. — Archiproporus minimus. 



4 (i) Mouth opening with or without a pharynx but not terminal at anterior end of body, or, if terminal or subter- 

 minal at anterior end, then male pore not terminal at posterior end 



10 



