PLATE C. 



Placobdella pediculata. 



Figs. 1, 2 and 3. Lateral, dorsal and ventral view respectively. 

 Fig. 4. Dorsal view of a young specimen!, showing the constitution 



of the somites and the positions of the organs. 

 Fig. 5. Portion of the isthmus of Aplodinotus grunniens, showing 



holes produced by the posterior sucker of P. pediculata. 

 Fig. 6. Longitudinal section of one of the holes shown in figure 5. 

 Fig. 7. Transverse section thru somite XIX, showing the position 



of the nephridial funnel on the left side. 

 Fig. 8. A nephridial funnel. 



Fig. 9. Drawing of a model of the esophageal glands and the posi- 

 # tion of the esophagus into which they empty. 



Fig. 10. Section thru three alveoli of the esophageal gland, showing 

 the striated gland cells. From a specimen hardened in Gil- 

 son's mercuro-nitric mixture and stained in paracarmine 

 and Lyons blue. 



