CRUSTACEA COPEPODA 



CHAP. 



probably belong to the tribe Isokerandria, and we meet with the 

 same variety of degrees of parasitism as in the Ampharthrandria, 

 often leading to very similar results. 



In the first seven families mentioned below there is no 



FIG. 37. Gopilia vitrea (Corycaeidae), ?, x 20. (After Giesbrecht. ) 



siphon. The Lichomolgidae and Ergasilidae have not much 

 departed from the free-living forms just considered, retaining 

 their segmentation, though in the Ergasilidae the body may be 

 somewhat distorted (Fig. 39). In both families the thoracic 

 swimming feet are of normal constitution. 



Fam. 3. Lichomolgidae. 1 These are semi -parasitic in a 

 number of animals living on the sea-bottom, such as Actinians, 



1 Canu, loc. cit. p. 66. 



