PLATE III. 



Fig. 1. Cermatia forceps. (Natural size. ) 

 la. Magnified view <>t' head of same. 



2. Spirobolus marginatus. (Natural size.) 

 2 a. Head of tin' sain.-. ( .Magnified. ) 



2b. Tail of the same. (Magnified.) 



3. This figure is a failure; il does noi even resemble what it was drawn from 



4. Poltdesmus erythroptgus. (Natural size.) 



5. Polydesmus floridus. (Natural size. ) 



6. Polydksmus CORRUGATUs. [Natural size.) 



6 a. Magnified view of under side of posterior portion of same. 



7. Polydesmus trimaculatus. (Natural size. ) 



8. Polydesmus Virginiensis. (Natural size.) 



