EXPLANATION OF PLATE XXVITI. 



FiCt. I. — Nais paraguayensis var. barkudensis ] distal end of 

 dorsal needle seta; X 800. 



,, 2. — Aulodrilus reniex; hinder end, showing zone of jiroli- 

 feration some distance in front of anus ; X ca 70. 



,, 3. — The same ; dorsal hair seta ; X 230. 



,, 4. — The same ; a, usual form, and b, exce]')tional form of 

 distal end of oar-shaped setae of dorsal bundles ; 

 X ca 1150. 



jj 5. — The same ; tip of ventral seta ; X ca. 1200. 



,, 6. — The same; tip of an exceptional form of ventral 

 seta ; X ca 1200. 



,, 7. — Drawida raui ; genital field ; X 18. cf , male pore. 



,, 8. — Plutcllus aqnatilis ; spermatheca. 



,, 9. — Megascolidcs annandalei \ spermatheca. 



,, 10. — Perionyx mysorensis; penial seta ; rt, general form, 

 X 130; i, distal end, more highly magnified ; X 

 ca. 400. 



,, II. — Eutyplioetis manipuiensis ; distal end of penial seta; 

 X ca. 150. 



,, 12. — Eiidichogaster barkudcnsis \ spermatheca. 



„ 13. — The same; penial seta; a, general form,x 125; h, 

 distal end more highly magnified, X 500. 



