EXPLANATION OF PLATES. 



Plate LX. 

 Female of Argulus canadensis. 



Fig. I. Dorsal view. 



Fig. 2. Respiratory areas. 



Fig. 3. First and second anteims. 



Fig. 4. Qiitin ribs supporting the margin of the 



sucking disks. 



Fig. s- Maxilliped. 



Fig. 6. Basal joints of fourth leg. 



Plate LXI. 

 Females of Argulus flavescens and A. mississippiensis. 



Fig. 7. Dorsal view of A. flavescens. 



Fig. 8. Respiratory areas. 



Fig. 9. First and second antennae. 



Fig. 10. Chitin ribs supporting the margin of the 



sucking disk. 

 Fig. II. Maxilliped. 



Fig. 12. Basal joints of fourth'swimming leg. 

 Fig. 13. Chitin ribs of sucking disk of A. 7nissis- 



sippiensis. 

 Fig. 14. Maxilliped. 

 Fig. 15. Second, third, and fourth swimming legs 



of male. 



Plate LXI I. 

 Male and female of .4 . lepidosiei and male of A . mississippiensis. 



Fig. 16. Dorsal vitv/ of male of A . lepidosiei. 

 Fig. 17. Third leg of male, showing accessory 



sexual apparatus. 

 Fig. 18. Chitin ribs supporting margin of sucking 



disk. 



Fig. 19. Maxilliped of female. 



Fig. 20. Chitin ribs supporting sucking disk of 



A . stizostethii. 

 Fig. 21. Dorsal view of male of .4 . mississippiensis. 



Plate LXIII. 

 Male and female of A rgulus mississippiensis. 



Fig. 22. 

 Fig. 23. 

 Fig. 24. 



Fig. 28. 

 Fig. 29. 

 Fig. 30. 



Dorsal view of female. 



Respiratory areas. 



First and second antennae. 



Fig. 25-27. Second, third, and fourth legs of 

 male, showing accessory sexual apparatus. 



Plate LXIV. 

 Male and female of Argulus lepidosiei. 



Dorsal view of female. 



Respiratory areas. 



First and second antennae. 



Fig. 31, 32. Second and fourthlegsof male, show 

 ing accessory sexual apparatus. 



• Plate LXV. 

 Newly hatched larva of Argulus lepidosiei. 



Fig. 33. 

 Fig. 34. 

 Fig. 35. 

 Fig. 36. 



37 



Dorsal view. 



First antenna. 



Second antenna. 



Mouth tube and first maxilla. 



Fig. 37. Second maxilla. 



Fig. 38. Maxilliped. 



Fig. 39. First swimming leg. 



