70 



ARTllROrOOA 



scu'iiientalion i< xisible. while llic appcmlagcs arc rudimcnlary or even entirely 

 losl. Indeed one wonid nol reeOL;ni.;e ihem as arthroinids save h>r the lolknving 

 fealnres: 



(r) Most of them lia\e the t}-|neal Copepod egg-sacs attached to the hinder 

 end. ^J') A conipk'le series ol intermediate forms allows one to trace, ,ste|) In- 

 step, the alterations of form from the freediving species to the most modil'ied 

 parasites. 13^ Ontogcnv is con\incing. Most parasitic Copepoda leave the 

 egg as a nauplius and pass through a Cyclops-stage before attaching themselves 



Fig, 



Fig. 3S0. Fio. 387. Fig. 3SS. 



:;S6. — Female LcnuToccrj csociiia ^from Lang, afler Claus). .1, armlike 



processcs\if anterior end; </, digcsti\-e tract; c.s, egg-saes; m/, oviduct; ',-',, rudimentary 

 thoracic appendages. 



Fig. 3S7. — Ari^idus foliaccus (from TAuhvig-l.eunis). a. sting; ci', antenna; h, 

 mouth; c, intestine with liver; d, abdomen; />/»', />)»-'. first and second ma.xillipeds; 

 p'-p'. biramous feet of thorax. 



Fig. 588. — Lcnucd bruiiiliiulis* (,orig.). 



to fishes and becoming the highly degenerate parasites. These parasites are 

 alwavs females. The males scarcely pass the Cyclops-stage, copulate with the 

 females and then die, or if they pass through the metamoriihosis, they remain 

 small and different in appearance (hg. 8). They occur attached to the female 

 near the genital openings. 'I'hcre is thus here a marked sexual dimorphism. 



Argitlid.e (sometimes made a distinct order, Branchiura), fresh-water forms 

 with compound eves, li\'cr lobes, and second ma.xillipeds nietamoriihosed into 

 suckers. Arf;iiliis'''- (hg. 387). C.vltcid.t-: (Calii^nx*), marine and brackish- 

 water. Li' j!X.EOPOPlD.F.. Fish parasites with maxilla- united into an adhesive 

 orizan. Aihlhcrcs* (fig. 6), perch. T>ern.eid.E; worm-like parasites. Lcrncra* (fig. 

 3S8) ; LenHcoccra* (fig. 3S6) ; Pnuila* 



