Plate V. 

 Fig. 1. Pontobdella murimta, 1.. Slightly enlarged. 

 Fig. 2. Piscicola geometra, L. Enlarged. 



Figs. -3, 4, & o. PotitobdeUa littornlis, Johnst., various positions, on Coitus 

 buhalis. 



Fig. 6. Sucker of the .same. All enlarged. 



Fig. 7. First pair of foot-jaws in a brilliantly-coloured male of Carciims 

 nuenas, L. 



Fig. 8. Under surface of the carapace of the same male. 



Fig. 9. Prostonmm (?) from deep water. 



