Sentence:  In the Entoprocta these can be easily made out, but in the Ectoprocta it is not always so distinct; in the forms where the zoœcium is elongated we seem to have the primitive disposition, in the flattened ones the tergal surface is increased in extent; <WSD>palingenesis</WSD> is to be seen in the Ectoprocta, cœnogenesis in the Entoprocta. 
Meaning of the word marked with <WSD> tags:  The apparent repetition, during the development of a single embryo, of changes that occurred previously in the evolution of its species.