4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡是雌雄同体的,生系统适体内受精。单起源的吸(单)多是鱼的外寄生。
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Cirripedes long appeared to me to present, under this point of view, a case of great difficulty; but I have been enabled, by a fortunate chance, to prove that two individuals, though both are self-fertilising hermaphrodites, do sometimes cross.
长期以来,在我看来,在这种观点下, 蜈蚣似乎是一个非常困难的案例;但幸运的是, 我得以证明两个个体, 尽管都是自花授精的雌雄同体, 有时确实会杂交。