THE CRUSTACEA 



body is embedded. Three ramified processes grow out from the 

 head into the tissues of the host, and the region of the genital 

 somite becomes enormously enlarged, forming the greater part of 



Fio. 52. 



Lerwiea oranchinlis. A, male ; B, female, at copulatory stage. C, D, later stages of female 

 after attachment to second host, a', antennule ; a", antenna ; /', /'", first and fourth pairs of 

 swimming-feet ; g, opening of spermatheca ; inxf, maxilliped ; oc, nauplius-eye ; sp, spermato- 

 phore sac ; t, testis. (After Glaus, from Korschelt and Heider's Embryology.) 



the vermiform body (Fig. 52, C, D). The swimming - feet are 

 retained in a vestigial condition near the anterior end. 



In some other forms parasitic on fish (Lernaeopodidae, Chon- 

 dracanthidae) the male is attached to the female in a dwarfed 

 condition throughout life. The larva becomes parasitic in the 



