334 P. R. DIXON-NUTTALL ON COPEUS PACHYURUS. 



The cavity of the body, which in the female contains the 

 mastax, stomach, etc., is filled with a large empty sac. 



The lumbar tentacles, with their retractile setse, are the same 

 as in the female. 



Four vibratile tags run down each side. 



The large sperm sac and protusile, ciliated penis are obvious. 

 I noticed the spermatozoa in active movement inside the sperm 

 sac. 



The size over all is ^y. 



