EXPLANATION OF PLATE IX. 



Fig. 



1. — Nais paraguayensis ; needles of the dorsal bundles ; a, with bifid outer 

 prong ; b, with bent inner prong. 



2. — Nais paraguayensis var. aequalis ; dorsal needle, x ca. 1200. 



3. — Nais gwaliorensis ; dorsal needle, x ca. 1100. 



4. — The same ; ventral setae ; a, of segments behind v ; b, of segments ii-v ; x 

 ca. 1100. 



5. — Megascolides prashadi ; male genital field. 



6. — The same ; spermatheca. 



7. — Perionyx sansibaricus ; region of male apertures. 



8. — Perionyx millardi ; spermathecae showing different characters of diverti- 

 cula ; a, specimen from Virar ; b, from Talegaon ; c, from Kalyan. 



9. — Perionyx rimatus ; spermatheca. 

 10. — Perionyx pokhrianus ; male genital field. 

 11. — The same ; spermatheca. 



12.— Perionyx pokhrianus var. affinis ; male genital field. 

 13. — The same ; spermatheca. 

 14. — Perionyx alatus ; male genital field. 

 15. — The same ; spermatheca. 

 16. — The same; tip of penial seta, x ca. 250. 

 17. — Perionyx shillongensis ; spermatheca. 

 18. — Perionyx fossus ; spermatheca . 

 19. — The same ; tip of penial seta, x ca. .400. 



