PLATE E. 



Placobdella peliculata 



Figs. 17, 18 and 19. Right lateral, ventral and left lateral view re- 

 spectively of the anterior portion of the central nervous 

 system with a portion of the proboscis. Reproductions 

 of photographs of a wax model made by the Horn recon- 

 struction method. 



Figs. 20, 21 and 22. Posterior, lateral and frontal view respectively 

 of the posterior ganglionic mass. Photographs of a wax 

 model made by the P>orn reconstruction method. 



