The evolution theory . Abd Fig. 112. Development of the parasitic Crustacean Sacculina carcini, afterDelage. A, Nauplius stage. Au, eye. I, II, III, the three pairs of appendages.B, Cypris-stage. VI-^I, the swimming appendages. C, mature animal {Sacc),attached to its host, the shore-crab {Carcinus mcenas), with a feltwork of fineroot-processes enveloping the crabs viscera, s, stalk. Sacc, body of theparasite, oe, aperture of the brood-cavit}. Abd, abdomen of the crab withthe anus (a), into the singular creature which we now see in the sexually matureform. The same is the case with the numerous
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The evolution theory . Abd Fig. 112. Development of the parasitic Crustacean Sacculina carcini, afterDelage. A, Nauplius stage. Au, eye. I, II, III, the three pairs of appendages.B, Cypris-stage. VI-^I, the swimming appendages. C, mature animal {Sacc), attached to its host, the shore-crab {Carcinus mcenas), with a feltwork of fineroot-processes enveloping the crabs viscera, s, stalk. Sacc, body of theparasite, oe, aperture of the brood-cavit}. Abd, abdomen of the crab withthe anus (a), into the singular creature which we now see in the sexually matureform. The same is the case with the numerous fish-parasites of theorder Copepoda. They all leave the egg as nauplius larvae, howevergreatly they may be modified later on by adaptation to a parasitichabit, and in them we can still observe, in the fully developedanimals, a whole series of grades of transformation. Thus manygenera, like Ergasilus, are distinguished from the free-swimmingCopepods only by the modification of their jaws into piercing andsucking organs