PHERETIMA. 



105. External Features. Draw a lateral view showing : prostomium ; peristomium; 

 mouth ; rings of chactoe ; clitellum ; apertures of oviduct and vas defcrens ; anus. 



106. External Features. Draw an enlarged ventral view of the anterior twenty- 

 five segments of the worm, showing the structures mentioned in the preceding paragraph. 



107. Chaetae. Remove one or two chsetaj irom the posterior end of the worm and 

 draw them under the microscope. 



