Plate IV. 



Fios. 



1, 2. Caligus minimus Otto. (p. 46.) 



1. Dorsal view, ? , x 11. 



2. Dorsal view, (J, x 11. 



3-8. Caligus rapax M. Edwards, (p. 48.) 



3. Early " chalimus " stage attached to fin-ray of a 



young cod, x 54. 



4. Late " chalimus " stage attached to tail of a young 



lumpsucker, x 15. 



5. Mature part of a frontal plate, shewing lateral 



sucker {lunula). 



6. Sternal fork, ? . 



7. Second maxilliped, ? . 



8. Foot of fourth pair, ? . 



(Figures 5-8 much enlarged.) 



