32 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



Fig. 12. — Copepoda. Developmental stages of the fish parasite Lernaeoccra 

 branchialis (L.). (A, C, D, E, G from Sproston, 1942; B from Pedaschenko, 

 1898; F, I from Capart, 1948; H, J from Scott, 1901.) 



A, nauplius, 0.37 mm. B, metanauplius. C, free-swimming copepodid. D, 

 third instar of chalimus stage on flounder. E, free-swimming adult male, 1.55 

 mm. F, young inseminated female on flounder. G, female on cod, beginning 

 metamorphosis to penella stage. H, female in fully developed penella stage. 

 1 1.4 mm. I, adult egg-carrying female on cod, 40 mm. J, section of mature 

 female. 



An, anus; AlCnl, alimentary canal; lAnt, first antenna; 2Ant, second an- 

 tenna ; CmGld, cement gland ; es, egg string ; Mth, mouth ; 2Mx, second maxilla ; 

 Mxpd, maxilliped; Odd, oviduct; Ov, ovary; Sphr, spermatophore. 



