7O 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 
Fic. 37.—Copilia vitrea (Coryeaeidae), 9, 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.'\—These are semi-parasitic in a 
number of animals living on the sea-bottom, such as Actinians, 
1 Cant, loc. cit. p. 66. 
