Fig. 9. — Copepoda: Monstrillidae. Larval stages and adult of Haemocera 

 danae (Claparede) parasitic in the polychaete SaJmacina dystcri Huxley (from 

 Malaquin, 1901). 



A, free nauplius. B, after penetration into host. C, same, with nutritive ten- 

 tacles (0- D, same, later stage. E, later stage, with cuticular envelope, rostrum 

 {R), and spines. F, begimiing transformation to adult inside cuticular sheath, 

 rudiment of abdomen {Ab) bent forward. G, later stage of male, showing testis 

 {Tes). H, specimen of Salmacina with two parasites in ventral blood vessel. 

 I, male parasite almost adult. J, adult female, free after shedding the sheath and 

 leaving the host; lAnt, first antenna, ef, egg filaments, gSeg, genital segment, 

 Ov, ovary. 



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