EXPLANATION OF PLATE XVI. 



Fig. I. — Drawida japonica ; genital region, showing copulatory 

 organs, (f , male papilla. 



,, 2. — Drawida ho dgarti \ prostate with the vas deferens enter- 

 ing ; the spirally curved portion is the ectal end of the 

 prostate. 



., 3. — Drawida rangamatiana ; appendage of sperniathecal atri- 

 um, as seen by transparency under the low power. 



,, 4. — Drawida nepalensis : appendage of spermathecal atrium. 



,, 5. — Pcrionyx pallidus \ spermatheca as seen under the low 

 power by transparency, a, bulging perhaps represent- 

 ing an incipient seminal chamber. 



6. — The same ; penial seta, X 235. 



7 

 8 



9 

 10 



ir 



12 



— Perionyx gravely i ; region of male apertures. 



— The same ; penial seta,X 150. 



— Perionyx aborensis var. heterochaetus : spermatheca. 



—Perionyx nanus ; region of male apertures. 



-Pheretima annandalei ; spermatheca. 



—Hoplcchaetella suctoria ; region of male apertures, 

 sucker-like depression ; pr., prostatic apertures. 



