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Embryo of Cryptoniscus planarioides, magnified 90 diam. The last pair of feet on the middle-body of the larva, consequently the penultimate pair in the adult animal, is almost always similar in structure to the preceding pair.
But Spence Bate, a careful observer, states that he has seen females of the form of Praniza laden with eggs far advanced in their development. Entoniscus Cancrorum, female, magnified 3 times. Cryptoniscus planarioides, female, magnified 3 times. In this order we meet for the first time with an extensive retrograde metamorphosis as a consequence of a parasitic mode of life.
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