PHERETIMA. 



110 Viscera (cont.). Remove the alimentary canal from the pharynx backwards, 

 being careful not to injure the structures beneath it. Draw : spermathecae with 

 diverticula; vesiculse seminales; vasa deferentia ; spermiducal glands; ovaries; oviduct; 

 nerve cord with ganglia. Open a vesicula seminalis to show the contained testis. 



111. Nephridium.- -Dissect out a nephridium of Lumbricus and examine it under the 

 low power. Make a drawing to show : nephrostome ; glandular part ; blood capillaries; 

 muscular terminal part. 





112. Spermatozoa. Remove a vesicula seminalis from a freshly killed worm, tease 

 the contents in a drop of 0-6 per cent salt solution on a slide. Cover and examine under 

 the high power. Draw spermatozoa at different stages of development. 



