PARAS ITA. 



241 



spermatophores, has attained full development. This free-swimming copulatory 

 Cyclops stage is the last stage of the male, the fertilised female, however, 

 seeks a new host (one of the Gadidae), in which she undergoes marked trans- 

 formation of the body 

 (Fig, 114 C and D). 

 The genital segment, 

 which has enlarged 

 for the development 

 of the eggs, is now a 

 large doubly -curved 

 portion of the body, 

 the small abdomen, 

 with its truncated 

 furcal appendages, 

 forming its termina- 

 tion. The cephalo- 

 thorax is changed by 

 the addition of three 

 horns which function 

 as barbed hooks, 

 carrying at their 

 points fork-like out- 

 growths. During 

 these transforma- 

 tions, the limbs are all 

 retained, but are to a 

 certain extent trans- 

 formed by strong 

 chitinisation. 



The remarkable 

 form Spliacronella, 

 Leuckartii, which is 

 parasitic in the brood- 

 cavity of ArupTrithoe, 

 is connected with 

 Lemaea by its 

 metamorphosis. 

 Salfnsky (No. 80) 

 found in Sphaeronella 

 an extremely degene- 

 rate pupal stage fol- 

 lowing the first free- 

 swimming Cyclops 

 stage. Neither seg- 

 mentation nor limbs 

 were recognisable in 

 the sac-like body 

 which was attached 



by a larval adhering apparatus to the epimeral plates of the host, 

 led, through gradual transitionary stages, to the adult form. 



Fig. 114. — Sexually mature stage of Lemaea branchialis (after 

 Claus). A, male. B, female at the copulatory stage. C and 

 D, later condition of the female transformed by parasitism, 

 slightly magnified, a', first, a", second antenna ; fi-fi v , first 

 four pairs of thoracic limbs; g, opening of the receptaculum 

 seininis ; mxf, maxillipede ; oc, eye ; sp, spermatophoral sac ; t, 

 left testis. 



This stage 

 The metamorphosis of the Lernaeopodidae is best known through the works 



