PLATE XVII. 



FIGS. 



1. Caligus diaphanus Nordmann. (p. 60.) 



1. Dorsal view, ? , x 13. 



2. Lepeophtheirus hippoglossi (Kroyer). (p. 67.) 



2. Dorsal view, immature. 



3. Lepeophtheirus thompsoni Baird. (p. 69.) 



3. Dorsal view, $ , x 8 '75. 



4. Lepeophtheirus salmonis (Kroyer) . (p. 71.) 



4. Dorsal view, $ , x 4. 



5, 6. Lepeophtheirus vollachii Bassett-Smith. (p. 73.) 



5. Dorsal view, $ , x 10. 



6. Dorsal view, $ , x 13. 



