ANNULATA. 219 



Laboratory Work. — Worms should be dissected at once after be- 

 inj; killed by ether or in alcohol, before the circulation has ceased ; 

 and transverse sections made to observe the relation of the appendages 

 to the body-walls, and of the difEerent systems within the body-walls. 

 The worms should also be hardened in alcohol, and thin sections 

 stained with carmine be made for histological study. A portion of the 

 worm can be put in paraffine and sliced by hand with the razor or by 

 the microtome. 



Amphitrite omata. 



