Bull. U. S. F. C. 1899. (To face page 104.) 
Plate 18. 
Fig. 19. Mastigocerca carinata Ehr. Side view. (X 490.) 
Fig. 20. Rattulus tigris Muller. Side view of retracted animal. 
(X 640.) 
Fig. 21. Rattulus tigris Muller, foot. Ventral view, with the two 
main toes crossed, showing the four substyles at the 
base of each toe. 
Fig. 22. Coelopus porcellus Gosse. Side view of retracted animal 
(X 640.) 
Fig. 23. Coelopus porcellus Gosse. Ventral view of lorica, showing 
the two teeth at the anterior margin and the six stylos 
on the foot. ( X 640. ) 
Fig. 24. Coelopus brachyurus Gosse. Side view of specimen with 
head extended. (X 640.) 
