Platk V. 
Fig. 1. Pontobdella muricata, L. Slightly enlarged. 
Fig. 2. Piscicola geometra, L. Enlarged. 
Figs. 3, 4, & 5. Pontobdella littoralis , Johnst., various positions, on Cottas 
bubalis. 
Fig. 6. Sucker of the same. All enlarged. 
Fig. 7. First pair of foot-jaws in a brilliantly-coloured male of Carcinus 
mcenas, L. 
Fig. 8. Under surface of the carapace of the same male. 
Fig. 9. Prostomum (?) from deep water. 
