PLATE XVIII. 



FIGS. 

 1-3. C aligns centrodonti Baird, ? . (p. 50.) 



1. Sternal fork. 



2. Second maxilliped. 



3. Foot of fourth pair. 



4, 5. Caligus labracis T. Scott, ? . (p. 53.) 



4. Sternal fork. 



5. Foot of fourth pair. 



6, 7. Caligus diaphanus Nordmann, ? . (p. 60.) 



6. Second maxilliped. 



7. Foot of fourth pair. 



8-10. Lepeophtheirus hippoglossi (Kroyer), ? . (p. 67.) 



8. Sternal fork. 



9. First maxilliped. 



10. Second maxilliped. 



11,12. Lepeophtheirus salmonis (Kroyer), ? (p. 71.) 



11. Sternal fork. 



12. Foot of fourth pair. 



13-15. Lepeophtheirus pollachii Bassett- Smith, $. (p. 73.) 



13. First maxilliped. 



14. Second maxilliped. 



15. Foot of fourth pair. 



16-19. Lepeophtheirus sturionis (Kroyer), ? . (p. 74.) 



16. Sternal fork. 



17. Second maxilliped. 



18. Foot of fourth pair. 



19. Furcal joints. 



(Figures much enlarged.) 



