EARTHWORM. 15 



(c) The openings of the oviducts : one on 



each side on the ventral aspect of the 

 14th somite. 



(d) The openings of the vasa deferentia : a 



conspicuous slit surrounded by swollen 

 lips, on each side on the ventral aspect 

 of the 15th somite. 



(e) Dorsal pores : one in each somite after the 



first two or three, in the median dorsal 

 line. 



(/) Nephridial openings : one pair in each 

 somite. (These cannot be seen with the 

 naked eye.) 

 (g) The anus : a vertical slit in the posterior 



(the anal) somite. 



Make two enlarged drawings (X 3 or X 4) of 

 the anterior end, a dorsal and a ventral 

 view, showing the first forty somites ; and a 

 sketch of the posterior end, dorsal aspect, 

 showing the last ten somites. 



C. ANATOMY. 



I. Extend a freslily killed worm dorsal side upper- 

 most in a dissect ing -pan and fasten it to the wax 

 by a pin at each end (the anterior pin through 

 the prostomium only). Cover the worm with 

 50 per cent, alcohol. With fine scissors cut care- 

 fully through the dorsal body-ivall a little to one 

 side of the median line. Note : 



