PLATE IV. 



Macrobdella decora, x 5. 



Fig. 24. Dorsal view of the anterior nine somites showing the annula- 

 tion, sensillse and metameric color features. The lightly 

 stippled blotches are red and the heavily stippled ones are 

 black. 



Fig. 25. Dorsal view of the posterior four trunk somites and sucker. 



Haemopis grandis. 



Fig. 26. Dorsal view of the anterior eight somites. X 5. 

 Fig. 27. Ventral view of the anterior eight somites. X 5. 

 Fig". 28. Dorsal view of several posterior somites. X 3. 



Haemopis plumbeus. x 3.3. 



Fig. 29. Dorsal view of the anterior eight somites, showing metameric 



sensillse and black blotches. 

 Fig. 30. Ventral view of the anterior eight somites. 

 Fig. 31. Dorsal view of several of the posterior somites. 



Haemopis marmoratus. x 5. 



Fig. 32. Lateral view of the anterior end, showing the annulation and 

 metameric sensillae. 



