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291 



sao-shaped. The females carry about the fertilised eggs in a paired or impaired 

 ovisac. GUIs are wanting. Free-living or commensal Copepoda : Cyclops, Cantho- 

 camptus, in fresh ivater ; Oetochilus, Clausocalamis (Fig. 194), marine; Notodelphys, 

 commensal in the branchial cavity of the Ascidianjs. Parasitic Copepoda : Corycceus, 

 Sapphirina (some of which are only occasionally or temporarily parasitic), Ghondra- 

 canthiis, Caligas, Lerncea, Ler-nmocem, Penella, Lernanthropus, Zernmasms, Achthercs, 

 Andiorella. 



Sub-Order 2. Branchiura (Argulidse), Carp Lice. 



Body consists of the flattened shield-shaped cephalo-thorax and the small flat 

 abdomen (caudal fin) divided longitudinally. In front of the oral suctorial tube a 



Fig. 195. — Argulus follaceus young male (after Claus). a^, Anterior, a^, posterior antenna ; pa, 

 paired eye ; ua, unpaired eye ; r, teak or suctorial tube enclosing the mandibles and maxillffi ; Icfi, 

 anterior maxillipede with the adhering disc ; fc^, posterior maxillipede ; sd, shell glands ; (7, intes- 

 tine with its lateral branched diverticula ; &i, 62) ^3> &4. thoracic feet ; ab, abdomen ; i, testc^i. 



long protrusible stylet. Four pairs of long cirrus-like biramose swimming feet. Two 

 large compound lateral eyes. Testes in the caudal fin. Heart present. Females 

 without ovisacs, attach the eggs to foreign objects. Argidus (Fig. 195), on the carp. 



Order 4. Cirripedia. 

 Characteristics of the attached forms : body indistinctly segmented, attached by 

 the head end, surrounded by a mantle which generally calcifies and then forms a 



